Resist material, pattern forming method, and patterned structure

Abstract

The objective of the present invention is to provide a novel resist material which is represented by general formula (I) and which contains: (A) a salt of a polyacid or a mixture thereof, wherein a cation moiety of said salt of a polyacid or said mixture thereof contains an onium cation or an onium dication having at least one polar group comprising an acid-dissociable group; and (B) an acid diffusion control agent. Also provided are a pattern formation method and a patterned structure. (I) (Am+)a(Bn+)b(C(am + bn)-)

Description

Resist material, pattern forming method, and patterned structure

[0001] The present invention relates to a resist material, a patterning method, and a patterned structure.

[0002] Polyacids are those having the general formula [M ｘ O ｙ ] ｎ－ (wherein x, y, and n are all natural numbers). The metal atom M constituting the polyacid is called a polyatom, and examples thereof include Mo (hexavalent or pentavalent), W (hexavalent or pentavalent), V (pentavalent), Nb (pentavalent), and Ta (pentavalent). The polyacid is an isopolyacid composed of the polyatom M and an oxygen acid, or a polyacid containing a different type of heteroatom X (for example, P as the heteroatom X) in addition to the polyatom M and oxygen. ５＋ , Si ４＋ , Ge ４＋ , B ３＋ Heteropolyacids containing [X ｗ M ｘ O ｙ ] ｎ－ (wherein w, x, y, and n are all natural numbers)

[0003] The physicochemical properties of polyacids, such as oxidation-reduction ability, reactivity to actinic rays, and acidity, can be changed depending on the combination of their constituent elements, their structure, the type of counter cation, and the like.

[0004] Patent Document 1 discloses an invention relating to a transfer method, which includes the steps of providing a layer of radiation-sensitive material containing a mixture of an organic compound such as polyvinyl alcohol and a polyoxometalate on a second material, exposing selected regions of the radiation-sensitive material layer to radiation to form a pattern in the layer, and then transferring the pattern into the second material underneath.

[0005] U.S. Pat. No. 5,178,989

[0006] An object of the present invention is to provide a novel resist material, a patterning method, and a patterned structure.

[0007] As a result of intensive research to solve the above-mentioned problems, the present inventors have found that by using an onium cation or dication having one or more polar groups having an acid-dissociable group as a counter cation of an isopolyacid anion or heteropolyacid anion, it is possible to provide a novel resist material that generates an acid upon exposure to DUV, XUV, EUV, an electron beam, or the like, and that can change the solubility in a developer by the action of the acid, thereby completing the present invention.

[0008] That is, the present invention relates to the following inventions: <1> A resist material containing (A) a polyacid salt represented by general formula (I) or a mixture thereof, and (B) an acid diffusion controller. ｍ＋ ) ａ (B ｎ＋ ) ｂ (C （ａｍ＋ｂｎ）－ ) (I) [wherein A ｍ＋ are each independently H ＋ , a metal ion, or an ammonium ion; B ｎ＋ each independently represents an onium cation or dication having one or more polar groups having an acid-dissociable group; （ａｍ＋ｂｎ）－represents an isopolyacid anion or a heteropolyacid anion; m is an integer from 1 to 5, n is an integer of 1 or 2, a is a real number, and b is a real number greater than 0.] <2> The resist material according to <1>, wherein the onium cation or dication having one or more polar groups having an acid-dissociable group is an organic sulfonium cation, organic sulfonium dication, or organic iodonium cation having one or more polar groups having an acid-dissociable group. <3> The resist material according to <1>, wherein the acid-dissociable group is a tertiary carbon-type acid-dissociable group, an allyl-type or benzyl-type acid-dissociable group, or an acetal-type acid-dissociable group. <4> The resist material according to <1>, wherein the isopolyacid anion is an isopolyoxomolybdate anion, an isopolyoxotungstate anion, an isopolyoxoniobate anion, or an isopolyoxotantalate anion. <5> The resist material according to <1>, wherein the polyatom of the heteropolyacid anion is Mo, W, V, Nb, or Ta, and the heteroatom is P, Si, B, S, or Ge. <6> The resist material according to <1>, wherein the (B) acid diffusion controller is (B1) a photodegradable base. <7> The resist material according to <1>, further comprising an organic solvent. <8> The resist material according to any one of <1> to <7>, wherein the resist material is for use with electron beams or EUV. <9> A pattern formation method comprising: forming a resist film using the resist material according to any one of <1> to <7>; exposing the resist film; and developing the exposed resist film using a developer. <10> The step of exposing the resist film comprises exposing the resist film to a light source at a concentration of 2 mC / cm ２ Electron beam or 200 mJ / cm ２ The pattern forming method according to <9>, comprising a step of exposing to extreme ultraviolet light. <11> A patterned structure obtained by patterning the resist material according to any one of <1> to <7>. <12> The patterned structure according to <11>, wherein the patterned structure has a portion with an average thickness of 1 to 100 nm.

[0009] <13> The tertiary carbon-type acid-dissociable group is a tertiary carbon-type acid-dissociable group G represented by general formula (g-1): ＡThe resist material according to <3>, [In formula (g-1), R Ａ ｇ１ is an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), R Ａ ｇ２ and R Ａ ｇ３ each independently represents a C １－１２ A hydrocarbyl group in which a divalent carbon atom at any position except the terminal is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), or R Ａ ｇ２ and R Ａ ｇ３ are combined to form C which may have a substituent. ３－１８ An alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, and a divalent carbon atom at any position except the terminal is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced).

[0010] <14> The acetal-type acid-dissociable group is an acetal-type acid-dissociable group G represented by general formula (g-3): Ｃ The resist material according to <3>, [In formula (g-3), R Ｃ ｇ１ and R Ｃ ｇ３ are each independently a hydro group or an optionally substituted C １－１２In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), R Ｃ ｇ２ is an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced.)

[0011] <15> The resist material according to <2>, wherein the organic sulfonium cation is an organic sulfonium cation represented by general formula (II-1): [In formula (II-1), R １Ａ , R １Ｂ and R １Ｃ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, １Ａ , R １Ｂ and R １Ｃ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ , R １Ｂ and R １ＣThe hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ one or more hydrogen atoms contained in the R are replaced by (t) a polar group having an acid-dissociable group, １Ａ , R １Ｂ and R １Ｃ Any two of these are directly connected to each other by a single bond, or are divalent linking groups -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the sulfur atom in formula (VII).

[0012] According to the present invention, it is possible to provide a novel resist material, a pattern formation method, and a patterned structure. The resist material according to the present invention contains a polyacid salt or a mixture thereof, and an onium cation or dication having one or more polar groups having an acid-dissociable group is introduced into the cation moiety of the polyacid salt or the mixture thereof. Therefore, by exposing the resist material according to the present invention, an acid is generated, and the action of the acid changes the solubility of the resist material in a developer, making it possible to form a pattern with good resolution.

[0013] Preferred embodiments of the present invention will be described in detail below, but the present invention is not limited to the following embodiments.

[0014] In this specification, the term "(meth)acryloyl group" is used to mean both an acryloyl group and a methacryloyl group.

[0015] As used herein, the term "halogen atom" refers to a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.

[0016] In this specification, for example, "C １－６ " and other terms refer to the number of carbon atoms in the core group.

[0017] As used herein, "C １－１８ The term "hydrocarbylene group" refers to a divalent hydrocarbon group generated by removing two hydrogen atoms from a hydrocarbon having 1 to 18 carbon atoms. The hydrocarbylene group may be linear or branched, or may be partially or entirely cyclic. The hydrocarbylene group includes alkylene groups, arylene groups, etc. Also, "C １－１８ The divalent carbon atom at any position of the "hydrocarbylene group" may be -O-, -S-, -C(=O)-, -COO-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, -SO-, or -SO ２ - may be substituted (however, adjacent divalent carbon atoms may not be substituted at the same time). １－１８The "hydrocarbylene group" is not particularly limited, and examples thereof include "C" such as methylene group, ethylene group, n-propylene group, i-propylene group, cyclopentadiyl group, cyclohexanediyl group, oxyethane-1,1-diyl group, oxyethane-1,2-diyl group, oxypropane-1,3-diyl group, oxypropane-1,2-diyl group, 2-methylpropane-1,3-diyl group, and oxyethyleneoxyethane-1,1-diyl group. １－１８ alkylene group"; 1,4-phenylene group, 1,3-phenylene group, 1,2-phenylene group, 1,4-naphthylene group, 1,5-naphthylene group, 1,8-naphthylene group, 4,4'-biphenylene group, anthracenediyl group, phenanthrenediyl group, naphthacenediyl group, pyrenediyl group, perylenediyl group, chrysenediyl group, etc. ６－１８ arylene group" and the like.

[0018] As used herein, "C １－１８ The term "alkyl group" means a linear or branched alkyl group having 1 to 18 carbon atoms. １－１８ The divalent carbon atom at any position excluding the terminal contained in the "alkyl group" is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ However, adjacent divalent carbon atoms may not be replaced at the same time. １－１８The "alkyl group" is not particularly limited, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group, an n-pentyl group, an i-pentyl group, a sec-pentyl group, a t-pentyl group, a neopentyl group, a 1-methylbutyl group, a 2-methylbutyl group, a 1,1-dimethylpropyl group, a 1,2-dimethylpropyl group, an n-hexyl group, an i-hexyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 3-methylpentyl group, a 1 , 1-dimethylbutyl group, 1,2-dimethylbutyl group, 2,2-dimethylbutyl group, 1,3-dimethylbutyl group, 2,3-dimethylbutyl group, 3,3-dimethylbutyl group, 1-ethylbutyl group, 2-ethylbutyl group, 1,1,2-trimethylpropyl group, 1,2,2-trimethylpropyl group, 1-ethyl-1-methylpropyl group, 1-ethyl-2-methylpropyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, and the like. １－１８ The alkyl group may have a divalent carbon atom at any position excluding the terminal, and the divalent carbon atom may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ The group substituted with - is not particularly limited, and examples thereof include a 2-methoxyethoxymethyl group, an ethoxycarbonylmethyl group, and the like.

[0019] As used herein, "C １－１８ The term "haloalkyl group" refers to "C １－１８ "C" means a group in which one or more hydrogen atoms of an "alkyl group" are substituted with halogen atoms. １－１８ The "haloalkyl group" is not particularly limited, and examples thereof include a dichloromethyl group, a trifluoromethyl group, a 2,2-difluoroethyl group, a 2,2,2-trifluoroethyl group, a pentafluoroethyl group, and a 3,3,3-trifluoropropyl group.

[0020] As used herein, "C ２－１８ The term "alkenyl group" refers to a group having two or more carbon atoms. １－１８"C" means an alkenyl group having one or more double bonds, and includes alkadienyl groups, alkatrienyl groups, etc. ２－１８ The "alkenyl group" is not particularly limited, and examples thereof include a vinyl group (ethenyl group), an allyl group (2-propenyl group), a 1-propenyl group, an isopropenyl group (1-methylvinyl group), a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, and a dodecenyl group.

[0021] As used herein, "C ２－１８ The term "alkynyl group" refers to a group having two or more carbon atoms. １－１８ "C" means an alkynyl group having one or more triple bonds in the "alkyl group." ２－１８ The "alkynyl group" is not particularly limited, and examples thereof include an ethynyl group, a 1-propynyl group, a 2-propynyl group, a pentynyl group, a hexynyl group, a heptynyl group, an octynyl group, a nonynyl group, a decynyl group, an undecynyl group, and a dodecynyl group.

[0022] As used herein, "C ３－１８ The term "alicyclic group" refers to a hydrocarbon group having, in whole or in part, a monocyclic or polycyclic structure having 3 to 18 carbon atoms. Alicyclic groups also include cycloalkyl groups, cycloalkenyl groups, cycloalkynyl groups, monocycloalkyl groups, polycycloalkyl groups, etc. ３－１８ A divalent carbon atom at any position excluding the terminals contained in the "alicyclic group" may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or SO ２ - may be substituted (however, adjacent divalent carbon atoms may not be substituted at the same time). ３－１８The "cycloalkyl group" is not particularly limited, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a 1-i-propylcyclopentan-1-yl group, a cyclohexyl group, a t-butylcyclohexyl group, a tricyclodecanyl group, a cycloheptyl group, a cyclooctyl group, a cyclodecyl group, a 2-methyladamantan-2-yl group, a 2-i-propyladamantan-2-yl group, a bornyl group, a norbornyl group, a fenchyl group, a pinanyl group, an adamantyl group, a tricyclodecyl group, a tetracyclododecyl group, a cyclopropylmethyl group, a cyclobutylmethyl group, a cyclopentylmethyl group, a cyclohexylmethyl group, a bornylmethyl group, a norbornylmethyl group, an adamantylmethyl group, a 1-methylcyclopentyloxycarbonylmethyl group, a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group.

[0023] As used herein, the term "3- to 18-membered non-aromatic heterocyclic group" refers to a 3- to 18-membered non-aromatic heterocyclic group containing one or more heteroatoms selected from the group consisting of nitrogen atoms, oxygen atoms, and sulfur atoms, and may be a monocyclic, polycyclic, or fused ring, and may be saturated or partially unsaturated. The "3- to 18-membered non-aromatic heterocyclic group" is not particularly limited, and examples thereof include an aziridinyl group, an azetidyl group, a pyrrolidinyl group, a pyrrolyl group, a piperidinyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a tetrahydrofuryl group, a tetrahydropyranyl group, an oxetanyl group, a tetrahydrofuryl group, a tetrahydropyranyl group, an imidazolinyl group, an oxazolinyl group, a 2,5-diazabicyclo[2.2.1]heptyl group, a 2,5-diazabicyclo[2.2.2]octyl group, a 3,8-diazabicyclo[3.2.1]octyl group, a 1,4-diazabicyclo[4.3.0]nonyl group, a 1-azaadamantyl group, and a 2-azaadamantyl group.

[0024] As used herein, "C ２－１８The term "aryl group" means an aromatic hydrocarbon cyclic group having 6 to 18 carbon atoms or an aromatic heterocyclic group having 2 to 10 carbon atoms. In the case of an aromatic heterocyclic group, a ring is formed by a carbon atom having 2 to 10 carbon atoms and one or more heteroatoms selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom, and each may be a monocyclic ring, a polycyclic ring, or a fused ring. ２－１８ The "aryl group" is not particularly limited, and examples thereof include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, an azulenyl group, a pentalenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a phenanthrenyl group, an anthracenyl group, and the like.

[0025] As used herein, "C ７－１８ The term "aralkyl group" refers to "C １－１２ The substitutable portion of the "C alkyl group" is ２－１２ "C" means a group substituted with an "aryl group." ７－１８ The "aralkyl group" is not particularly limited, and examples thereof include a benzyl group, a phenethyl group, a 3-phenylpropyl group, a 4-phenylbutyl group, a 1-naphthylmethyl group, and a 2-naphthylmethyl group.

[0026] As used herein, "C １－１８ The term "hydrocarbyl group" refers to a monovalent group formed by removing one hydrogen atom from a hydrocarbon having 1 to 18 carbon atoms. Hydrocarbyl groups include alkyl groups, alkenyl groups, alkynyl groups, alicyclic groups, aryl groups, aralkyl groups, and the like. １－１８ A divalent carbon atom at any position excluding the terminal contained in the "hydrocarbyl group" may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ - (however, adjacent divalent carbon atoms cannot be replaced at the same time). １－１８ The term "C" used in the definition of "hydrocarbyloxy group" and the like is used in the definition of "C" １－１８ The same applies to "hydrocarbyl group" and the like. １－１８ The "hydrocarbyl group" is not particularly limited, and examples thereof include "C １－１８alkyl group," "C ２－１８ alkenyl group," "C ２－１８ alkynyl group," "C ３－１８ “Alicyclic group”, “C ２－１８ aryl group," "C ７－１８ aralkyl groups, etc.

[0027] As used herein, "C １－１８ The term "hydrocarbyloxy group" refers to a group consisting of "C １－１８ "C" means a group in which an oxygen atom (-O-) is bonded to a "hydrocarbyl group." １－１８ The "hydrocarbyloxy group" is not particularly limited, and examples thereof include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a sec-butoxy group, a t-butoxy group, an n-pentoxy group, an i-pentoxy group, a sec-pentoxy group, an n-hexoxy group, an i-hexoxy group, a 1,1-dimethylpropyloxy group, a 1,2-dimethylpropyloxy group, a 2,2-dimethylpropyloxy group, a 1-methyl- "C" groups such as 2-ethylpropyloxy group, 1-ethyl-2-methylpropyloxy group, 1,1,2-trimethylpropyloxy group, 1,2,2-trimethylpropyloxy group, 1,1-dimethylbutyloxy group, 1,2-dimethylbutyloxy group, 2,2-dimethylbutyloxy group, 2,3-dimethylbutyloxy group, 1,3-dimethylbutyloxy group, 2-ethylbutyloxy group, 2-methylpentyloxy group, and 3-methylpentyloxy group １－１８ alkoxy group"; cyclopropyloxy group, cyclobutyloxy group, cyclopentyloxy group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, 1-methylcyclopentyloxycarbonylmethoxy group, 1-ethylcyclohexyloxycarbonylmethoxy group, 1-methyladamantyloxycarbonylmethoxy group, etc. ３－１８ alicyclic oxy group"; phenyloxy group, 1-naphthyloxy group, 2-naphthyloxy group, azulenyloxy group, pentalenyloxy group, heptalenyloxy group, indacenyloxy group, acenaphthyloxy group, phenanthrenyloxy group, anthracenyloxy group, etc. ６－１８ aryloxy group."１－１８ The "hydrocarbyloxy group" includes "C １－１８ It is preferred that a divalent carbon atom at any position except the terminal contained in the "hydrocarbyl group" is replaced with -O-, -C(=O)-, and / or -C(=O)O-. １－１８ A "hydrocarbyloxycarbonylalkyloxy group" is more preferred, and from the viewpoint of solubility, it is even more preferred that the carbon bonded to the oxygen atom of the hydrocarbyloxy is a tertiary carbon. Specific examples of the hydrocarbyloxy include optionally substituted ethylcyclopentyloxy, methyladamantyloxy, ethyladamantyloxy, t-butyloxy, etc.

[0028] As used herein, "C １－１８ The term "hydrocarbyl carbonyl group" refers to a group consisting of "C １－１８ It means a group in which a carbonyl group (—C(═O)—) is bonded to a “hydrocarbyl group.” １－１８ The "hydrocarbyl carbonyl group" is not particularly limited, and examples thereof include "C" such as an acetyl group, a propionyl group, an isopropionyl group, a butyryl group, an isobutyryl group, a valeryl group, an isovaleryl group, a pentanoyl group, a 3-methylbutanoyl group, a pivaloyl group, a hexanoyl group, and a heptanoyl group. １－１８ alkylcarbonyl group"; cyclopropylcarbonyl group, cyclobutylcarbonyl group, cyclopentylcarbonyl group, 2-methylcyclopentylcarbonyl group, 3-methylcyclopentylcarbonyl group, cyclohexylcarbonyl group, 2-methylcyclohexylcarbonyl group, 3-methylcyclohexylcarbonyl group, 4-methylcyclohexylcarbonyl group, adamantylcarbonyl group, etc. ３－１８ alicyclic carbonyl group"; "C" such as benzoyl group, 1-naphthoyl group, 2-naphthoyl group, etc. ６－１８ arylcarbonyl group" and the like.

[0029] As used herein, "C １－１８ The term "hydrocarbylcarbonyloxy group" refers to a group consisting of "C １－１８ "C" means a group in which an oxygen atom (-O-) is bonded to a "hydrocarbyl carbonyl group." １－１８The "hydrocarbylcarbonyloxy group" is not particularly limited, and examples thereof include "C" such as a methylcarbonyloxy group, an ethylcarbonyloxy group, an n-propylcarbonyloxy group, an isopropylcarbonyloxy group, an n-butylcarbonyloxy group, an isobutylcarbonyloxy group, a t-butylcarbonyloxy group, an n-pentylcarbonyloxy group, an isopentylcarbonyloxy group, and a hexylcarbonyloxy group. １－１８ alkylcarbonyloxy group"; cyclopropylcarbonyloxy group, cyclobutylcarbonyloxy group, cyclopentylcarbonyloxy group, cyclohexylcarbonyloxy group, etc. ３－１８ alicyclic carbonyloxy group"; "C" such as a phenylcarbonyloxy group, a naphthylcarbonyloxy group, an acenaphthylcarbonyloxy group, a phenanthrenylcarbonyloxy group, an anthracenylcarbonyloxy group, etc. ６－１８ arylcarbonyloxy group" and the like.

[0030] As used herein, "C １－１８ The term "hydrocarbyloxycarbonyl group" refers to a group consisting of "C １－１８ It means a group in which a carbonyl group (—C(═O)—) is bonded to a “hydrocarbyloxy group.” １－１８ The "hydrocarbyloxycarbonyl group" is not particularly limited, and examples thereof include "C" such as a methoxycarbonyl group, an ethoxycarbonyl group, an n-propoxycarbonyl group, an i-propoxycarbonyl group, an n-butoxycarbonyl group, an i-butoxycarbonyl group, a sec-butoxycarbonyl group, a t-butoxycarbonyl group, an n-pentoxycarbonyl group, and a neopentyloxycarbonyl group. １－１８ alkoxycarbonyl group"; "C" such as a cyclopropyloxycarbonyl group, a cyclobutyloxycarbonyl group, a cyclopentyloxycarbonyl group, a cyclohexyloxycarbonyl group, a 2-methylcyclopentyloxycarbonyl group, a 3-methylcyclopentyloxycarbonyl group, a 2-methylcyclohexyloxycarbonyl group, a 3-methylcyclohexyloxycarbonyl group, and a 4-methylcyclohexyloxycarbonyl group; ３－１８alicyclic oxycarbonyl group"; "C" such as a phenoxycarbonyl group, a naphthoxycarbonyl group, an acenaphthyloxycarbonyl group, a phenanthrenyloxycarbonyl group, an anthracenyloxycarbonyl group, etc. ６－１８ aryloxycarbonyl group" and the like.

[0031] As used herein, "C １－１８ The term "hydrocarbyloxycarbonyloxy group" refers to a group consisting of "C １－１８ "C" means a group in which an oxygen atom (-O-) is bonded to a "hydrocarbyloxycarbonyl group." １－１８ The "hydrocarbyloxycarbonyloxy group" is not particularly limited, and examples thereof include "C" such as a methoxycarbonyloxy group, an ethoxycarbonyloxy group, an n-propyloxycarbonyloxy group, an i-propyloxycarbonyloxy group, an n-butoxycarbonyloxy group, an i-butoxycarbonyloxy group, a sec-butoxycarbonyloxy group, a t-butoxycarbonyloxy group, an n-pentyloxycarbonyloxy group, an i-pentyloxycarbonyloxy group, and an n-hexyloxycarbonyloxy group. １－１８ alkoxycarbonyloxy group"; "C" such as cyclopropyloxycarbonyloxy group, cyclobutyloxycarbonyloxy group, cyclopentyloxycarbonyloxy group, cyclohexyloxycarbonyloxy group, etc. ３－１８ alicyclic oxycarbonyloxy group"; "C" such as a phenoxycarbonyloxy group, a naphthoxycarbonyloxy group, an acenaphthyloxycarbonyloxy group, a phenanthrenyloxycarbonyloxy group, an anthracenyloxycarbonyloxy group, etc. ６－１８ aryloxycarbonyloxy group" and the like.

[0032] As used herein, "C １－１８ The term "hydrocarbylamino group" refers to a group consisting of one "C １－１８ "C" means a group bonded to an amino group. １－１８The "hydrocarbylamino group" is not particularly limited, and examples thereof include a "C hydrocarbylamino group" such as a methylamino group, an ethylamino group, an n-propylamino group, an i-propylamino group, an n-butylamino group, an i-butylamino group, a sec-butylamino group, a t-butylamino group, an n-pentylamino group, an i-pentylamino group, a neopentylamino group, and an n-hexylamino group. １－１８ alkylamino group"; cyclopropylamino group, cyclobutylamino group, cyclopentylamino group, 2-methylcyclopentylamino group, 3-methylcyclopentylamino group, cyclohexylamino group, 2-methylcyclohexylamino group, 3-methylcyclohexylamino group, 4-methylcyclohexylamino group, etc. ３－１８ alicyclic amino group"; phenylamino group, 1-naphthylamino group, 2-naphthylamino group, etc. ６－１８ arylamino group" and the like.

[0033] As used herein, "diC １－１８ The term "hydrocarbylamino group" refers to two identical or different "C １－１８ "DiC" means a group in which a "hydrocarbyl group" is bonded to an amino group. １－１８ The "hydrocarbylamino group" is not particularly limited, and examples thereof include a dimethylamino group, a diethylamino group, a di-n-propylamino group, a diisopropylamino group, a di-n-butylamino group, a diisobutylamino group, a di-t-butylamino group, a di-n-pentylamino group, a di-n-hexylamino group, an N-ethyl-N-methylamino group, an N-methyl-N-n-propylamino group, an N-isopropyl-N-methylamino group, an N-n-butyl-N-methylamino group, an N N-isobutyl-N-methylamino group, N-t-butyl-N-methylamino group, N-methyl-N-n-pentylamino group, N-n-hexyl-N-methylamino group, N-ethyl-N-n-propylamino group, N-ethyl-N-isopropylamino group, N-n-butyl-N-ethylamino group, N-ethyl-N-isobutylamino group, N-t-butyl-N-ethylamino group, N-ethyl-N-n-pentylamino group, N-ethyl-N-n-hexylamino group, and other "di-C １－１８alkylamino group"; "di-C" such as dicyclopropylamino group, dicyclobutylamino group, dicyclopentylamino group, dicyclohexylamino group, etc. ３－１８ alicyclic amino group"; "di-C" such as diphenylamino group, phenylnaphthylamino group, etc. ６－１８ "N-C arylamino group" such as N-methylcyclopentanamino group, N-methylcyclohexylamino group, etc. １－１８ Alkyl-N—C ３－１８ cycloalkylamino group"; "N-C cycloalkylamino group" such as N-methyl-2-phenylethylamino group, N-ethyl-N-(4-methylphenyl)amino group, etc. １－１８ Alkyl-N—C ６－１８ arylamino group" and the like.

[0034] As used herein, "C １－１８ The term "hydrocarbylaminocarbonyl group" refers to a group consisting of "C １－１８ It means a group in which a carbonyl group (—C(═O)—) is bonded to a “hydrocarbylamino group.” １－１８ The "hydrocarbylaminocarbonyl group" is not particularly limited, and examples thereof include "C" such as a methylaminocarbonyl group, an ethylaminocarbonyl group, an n-propylaminocarbonyl group, an i-propylaminocarbonyl group, an n-butylaminocarbonyl group, a sec-butylaminocarbonyl group, a t-butylaminocarbonyl group, an n-pentylaminocarbonyl group, a 2-pentylaminocarbonyl group, a neopentylaminocarbonyl group, a 4-methyl-2-pentylaminocarbonyl group, an n-hexylaminocarbonyl group, and a 3-methyl-n-pentylaminocarbonyl group. １－１８ alkylaminocarbonyl group"; cyclopropylaminocarbonyl group, cyclobutylaminocarbonyl group, cyclopentylaminocarbonyl group, cyclohexylaminocarbonyl group, 2-methylcyclopentylaminocarbonyl group, 3-methylcyclopentylaminocarbonyl group, 2-methylcyclohexylaminocarbonyl group, 3-methylcyclohexylaminocarbonyl group, 4-methylcyclohexylaminocarbonyl group, etc. ３－１８ alicyclic aminocarbonyl group"; phenylaminocarbonyl group, 1-naphthylaminocarbonyl group, 2-naphthylaminocarbonyl group, etc.６－１８ arylaminocarbonyl group.

[0035] As used herein, "diC １－１８ The term "hydrocarbylaminocarbonyl group" refers to a "diC １－１８ "DiC" means a group in which a carbonyl group (-C(=O)-) is bonded to a "hydrocarbylamino group." １－１８ The "hydrocarbylaminocarbonyl group" is not particularly limited, and examples thereof include a dimethylaminocarbonyl group, a diethylaminocarbonyl group, a di-n-propylaminocarbonyl group, a diisopropylaminocarbonyl group, a di-n-butylaminocarbonyl group, a diisobutylaminocarbonyl group, a di-t-butylaminocarbonyl group, a di-n-pentylaminocarbonyl group, a di-n-hexylaminocarbonyl group, an N-ethyl-N-methylaminocarbonyl group, an N-methyl-N-n-propylaminocarbonyl group, an N-isopropyl-N-methylaminocarbonyl group, an N-n-butyl-N-methylaminocarbonyl group, an "DiC" groups such as a carboxyl group, an N-isobutyl-N-methylaminocarbonyl group, an N-t-butyl-N-methylaminocarbonyl group, an N-methyl-N-n-pentylaminocarbonyl group, an N-n-hexyl-N-methylaminocarbonyl group, an N-ethyl-N-n-propylaminocarbonyl group, an N-ethyl-N-isopropylaminocarbonyl group, an N-n-butyl-N-ethylaminocarbonyl group, an N-ethyl-N-isobutylaminocarbonyl group, an N-t-butyl-N-ethylaminocarbonyl group, an N-ethyl-N-n-pentylaminocarbonyl group, and an N-ethyl-N-n-hexylaminocarbonyl group. １－１８ alkylamino group"; "di-C" such as dicyclopropylaminocarbonyl group, dicyclobutylaminocarbonyl group, dicyclopentylaminocarbonyl group, dicyclohexylaminocarbonyl group, etc. ３－１８ alicyclic aminocarbonyl group"; "di-C" such as diphenylaminocarbonyl group, phenylnaphthylaminocarbonyl group, etc. ６－１８ arylaminocarbonyl group" and the like.

[0036] As used herein, "C １－１８ The term "hydrocarbylcarbonylamino group" refers to a group consisting of "C １－１８"C" means a group in which an amino group is bonded to a "hydrocarbyl carbonyl group." １－１８ The "hydrocarbylcarbonylamino group" is not particularly limited, and examples thereof include "C" such as methylcarbonylamino group, ethylcarbonylamino group, n-propylcarbonylamino group, i-propylcarbonylamino group, n-butylcarbonylamino group, i-butylcarbonylamino group, sec-butylcarbonylamino group, t-butylcarbonylamino group, n-pentylcarbonylamino group, i-pentylcarbonylamino group, and n-hexylcarbonylamino group. １－１８ alkylcarbonylamino group; cyclopropylcarbonylamino group, cyclobutylcarbonylamino group, cyclopentylcarbonylamino group, cyclohexylcarbonylamino group, etc. ３－１８ alicyclic carbonylamino group"; "C" such as phenylcarbonylamino group, naphthylcarbonylamino group, acenaphthylcarbonylamino group, phenanthrenylcarbonylamino group, anthracenylcarbonylamino group, etc. ６－１８ arylcarbonylamino group" and the like.

[0037] As used herein, "C １－１８ The term "hydrocarbylaminocarbonyloxy group" refers to a group consisting of "C １－１８ "C" means a group in which an oxygen atom (-O-) is bonded to a "hydrocarbylaminocarbonyl group." １－１８ The "hydrocarbylaminocarbonyloxy group" is not particularly limited, and examples thereof include "C" such as a methylaminocarbonyloxy group, an ethylaminocarbonyloxy group, and an n-propylaminocarbonyloxy group. １－１８ alkylaminocarbonyloxy group"; cyclopropylaminocarbonyloxy group, cyclohexylaminocarbonyloxy group, etc. ３－１８ alicyclic aminocarbonyloxy group"; phenylaminocarbonyloxy group, 1-naphthylaminocarbonyloxy group, etc. ６－１８ arylaminocarbonyloxy group" and the like.

[0038] As used herein, "diC １－１８ The term "hydrocarbylaminocarbonyloxy group" refers to a "diC １－１８"DiC" means a group in which an oxygen atom (—O—) is bonded to a "hydrocarbylaminocarbonyl group." １－１８ The "hydrocarbylaminocarbonyloxy group" is not particularly limited, and examples thereof include "diC" such as dimethylaminocarbonyloxy group, diethylaminocarbonyloxy group, and di-n-propylaminocarbonyloxy group. １－１８ alkylaminocarbonyloxy group, etc.

[0039] As used herein, "C １－１８ The term "hydrocarbylaminocarbonylamino group" refers to a group consisting of "C １－１８ "Hydrocarbylaminocarbonyl group" means a group bonded to an amino group. １－１８ The "hydrocarbylaminocarbonylamino group" is not particularly limited, and examples thereof include "C" such as methylaminocarbonylamino group, ethylaminocarbonyloxy group, and n-propylaminocarbonylamino group. １－１８ alkylaminocarbonylamino group"; cyclopropylaminocarbonylamino group, cyclohexylaminocarbonylamino group, etc. ３－１８ alicyclic aminocarbonylamino group"; phenylaminocarbonylamino group, 1-naphthylaminocarbonylamino group, etc. ６－１８ arylaminocarbonylamino group" and the like.

[0040] As used herein, "diC １－１８ The term "hydrocarbylaminocarbonylamino group" refers to a "diC １－１８ "Hydrocarbylaminocarbonyl group" means a group bonded to an amino group. １－１８ The "hydrocarbylaminocarbonylamino group" is not particularly limited, and examples thereof include "diC" such as dimethylaminocarbonylamino group, diethylaminocarbonylamino group, and di-n-propylaminocarbonylamino group. １－１８ alkylaminocarbonylamino group, etc.

[0041] As used herein, "C １－１８ The term "hydrocarbyloxycarbonylamino group" refers to a group consisting of "C １－１８"C" means a group in which a "hydrocarbyloxycarbonyl group" is bonded to an amino group. １－１８ The "hydrocarbyloxycarbonylamino group" is not particularly limited, and examples thereof include "C" such as a methoxycarbonylamino group, an ethoxycarbonylamino group, an n-propoxycarbonylamino group, an i-propoxycarbonylamino group, an n-butoxycarbonylamino group, and a t-butoxycarbonylamino group. １－１８ alkoxycarbonylamino group"; cyclopropyloxycarbonylamino group, cyclohexyloxycarbonylamino group, etc. ３－１８ alicyclic oxycarbonylamino group"; phenyloxycarbonylamino group, 1-naphthyloxycarbonylamino group, etc. ６－１８ aryloxycarbonylamino group" and the like.

[0042] As used herein, "C １－１８ The term "hydrocarbylthio group" refers to a group consisting of "C １－１８ "C" means a group in which a sulfur atom (-S-) is bonded to a "hydrocarbyl group." １－１８ The "hydrocarbylthio group" is not particularly limited, and examples thereof include a "C methylthio group, an ethylthio group, an n-propylthio group, an i-propylthio group, an n-butylthio group, an i-butylthio group, a t-butylthio group, an n-pentylthio group, an n-hexylthio group, etc. １－１８ alkylthio group"; cyclopropylthio group, cyclobutylthio group, cyclopentylthio group, cyclohexylthio group, 2-methylcyclopentylthio group, 3-methylcyclopentylthio group, 2-methylcyclohexylthio group, 3-methylcyclohexylthio group, 4-methylcyclohexylthio group, etc. ３－１８ alicyclic thio group"; "C" such as a phenylthio group, a 1-naphthylthio group, a 2-naphthylthio group, an acenaphthylthio group, a phenanthrenylthio group, an anthracenylthio group, etc. ６－１８ arylthio group" and the like.

[0043] As used herein, "C １－１８ The term "hydrocarbylsulfinyl group" refers to a group consisting of "C １－１８ "C" means a group in which a sulfinyl group (-S(=O)-) is bonded to a "hydrocarbyl group."１－１８ The "hydrocarbylsulfinyl group" is not particularly limited, and examples thereof include "C" such as methylsulfinyl group, ethylsulfinyl group, n-propylsulfinyl group, i-propylsulfinyl group, n-butylsulfinyl group, t-butylsulfinyl group, pentylsulfinyl group, and hexylsulfinyl group. １－１８ alkylsulfinyl group"; cyclopropylsulfinyl group, cyclobutylsulfinyl group, cyclopentylsulfinyl group, cyclohexylsulfinyl group, 2-methylcyclopentylsulfinyl group, 3-methylcyclopentylsulfinyl group, 2-methylcyclohexylsulfinyl group, 3-methylcyclohexylsulfinyl group, 4-methylcyclohexylsulfinyl group, etc. ３－１８ alicyclic sulfinyl group"; "C" such as a phenylsulfinyl group, a naphthylsulfinyl group, an acenaphthylsulfinyl group, a phenanthrenylsulfinyl group, an anthracenylsulfinyl group, etc. ６－１８ arylsulfinyl group" and the like.

[0044] As used herein, "C １－１８ The term "hydrocarbylsulfonyl group" refers to a group consisting of "C １－１８ The hydrocarbyl group may be a sulfonyl group (-SO ２ -) is bonded to the group. １－１８ The "hydrocarbylsulfonyl group" is not particularly limited, and examples thereof include "C" such as a methylsulfonyl group, an ethylsulfonyl group, an n-propylsulfonyl group, an i-propylsulfonyl group, an n-butylsulfonyl group, a t-butylsulfonyl group, and a pentylsulfonyl group. １－１８ alkylsulfonyl group"; "C" such as cyclopropylsulfonyl group, cyclobutylsulfonyl group, cyclopentylsulfonyl group, cyclohexylsulfonyl group, 2-methylcyclopentylsulfonyl group, 3-methylcyclopentylsulfonyl group, 2-methylcyclohexylsulfonyl group, 3-methylcyclohexylsulfonyl group, and 4-methylcyclohexyl group; ３－１８ alicyclic sulfonyl group"; "C" such as a phenylsulfonyl group, a naphthylsulfonyl group, an acenaphthylsulfonyl group, a phenanthrenylsulfonyl group, an anthracenylsulfonyl group, etc. ６－１８arylsulfonyl group" and the like.

[0045] As used herein, the term "acid-dissociable group" refers to a group that substitutes a hydrogen atom of a polar group, such as a hydroxy group (including a phenolic hydroxy group), a carboxy group, an amino group, or a sulfo group, and dissociates under the action of an acid. A compound having the acid-dissociable group can increase the polarity of the compound by dissociating the acid-dissociable group under the action of an acid, thereby generating the polar group. This can change the solubility of the compound in a developer. More specifically, when a highly polar developer, such as an alkaline aqueous solution, is used as the developer, the solubility of the compound in the developer relatively increases, while when a less polar organic developer is used as the developer, the solubility of the compound in the developer relatively decreases. Preferred polar groups include a hydroxy group (including a phenolic hydroxy group) and a carboxy group.

[0046] The acid-dissociable group is not particularly limited, and any known and commonly used acid-dissociable group that can be used in chemically amplified resists can be used. Examples of the acid-dissociable group include an acid-dissociable group G for a polar group having an acid-dissociable group represented by the following general formulas (G-1) to (G-4).

[0047] The acid-dissociable group G is not particularly limited as long as it dissociates under the action of an acid, and any known and commonly used group can be used. Examples of the acid-dissociable group G include "tertiary carbon-type acid-dissociable groups G" represented by the following general formula (g-1): Ａ ", "allyl or benzyl acid-dissociable group G represented by the following general formula (g-2) Ｂ ", "acetal-type acid-dissociable group G represented by the following general formula (g-3) Ｃ Each of these will be explained in turn below.

[0048] <Tertiary carbon type acid dissociable group G ＡThe acid-dissociable group G is a "tertiary carbon-type acid-dissociable group G" represented by the following general formula (g-1): Ａ ", a carbon atom directly bonded to a polar group, and R Ａ ｇ１ ~R Ａ ｇ３ An acid-labile group in which the carbon atom to which the group is bonded is a tertiary carbon atom can be used.

[0049] "R Ａ ｇ１ " is an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0050] R Ａ ｇ１ As the C １－１２ Alkyl group, C ３－１２ Alicyclic group, C ６－１２ an aryl group, or C ７－１２ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１２ an alkyl group or C ３－１２ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0051] Also, "R Ａ ｇ２ " and "R Ａ ｇ３" are each independently a C １－１２ A hydrocarbyl group in which a divalent carbon atom at any position except the terminal is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), or R Ａ ｇ２ and R Ａ ｇ３ are combined to form C which may have a substituent. ３－１８ An alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, and a divalent carbon atom at any position except the terminal is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ It may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0052] R Ａ ｇ２ and R Ａ ｇ３ As for R Ａ ｇ２ and R Ａ ｇ３ are combined to form C which may have a substituent. ３－１８ An alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, and a divalent carbon atom at any position except the terminal is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and ３－１８The alicyclic group or the 3- to 18-membered non-aromatic heterocyclic group contains a cyclopentane skeleton, a cyclohexane skeleton, a cycloheptane skeleton, a cyclooctane skeleton, a cyclononane skeleton, a cyclodecane skeleton, a cyclododecane skeleton, a cyclopentene skeleton, a cyclohexene skeleton, a cycloheptene skeleton, a cyclooctene skeleton, a cyclodecene skeleton, a norbornane skeleton, an adamantane skeleton, a tricyclodecane skeleton, a tetracyclododecane skeleton, a norbornene skeleton, or a tricyclodecene skeleton, and a divalent carbon atom at any position excluding the terminal is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ It is more preferable that the group may be substituted with - (provided that adjacent divalent carbon atoms are not simultaneously substituted).

[0053] A tertiary carbon-type acid-dissociable group G represented by general formula (g-1): Ａ Examples of the aryl group include a t-butyl group, a t-amyl group, a 1,1-dimethylpropyl group, a 1-methyl-1-cyclopentyl group, a 1-ethyl-1-cyclopentyl group, a 1-methyl-1-cyclohexyl group, a 1-ethyl-1-cyclohexyl group, a 2-methyl-2-adamantyl group, a 2-ethyl-2-adamantyl group, a 1-(1-methoxy-2-methylpropan-2-yl)cyclopentyl group, and a 1-(1-ethoxy-2-methylpropan-2-yl)cyclopentyl group.

[0054] <<Tertiary carbon type acid dissociable group G Ａ１ and G Ａ２ >> Also, the "tertiary carbon-type acid-dissociable group G" represented by general formula (g-1) Ａ " In R Ａ ｇ２ and R Ａ ｇ３ are combined to form C which may have a substituent. ３－１８ In the case where an alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, for example, a tertiary carbon-type acid-dissociable group G represented by the following general formula (g-1-1) is included: Ａ１ and a tertiary carbon-type oxygen-dissociating group G represented by (g-1-2): Ａ２ etc.

[0055] <<Tertiary carbon-type acid-dissociable group G represented by general formula (g-1-1) Ａ１ >> A tertiary carbon-type acid-dissociable group G represented by the above general formula (g-1-1): Ａ１ In this case, R Ａ ｇ１１ is a C which may have a substituent １－１２ Alkyl group, C ３－１２ Alicyclic group, C ６－１２ an aryl group, or C ７－１２ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0056] Also Cy Ａ ｇ１ represents a C which may have a substituent together with the tertiary carbon atom. ３－１８ An alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, and any divalent carbon atom is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0057] Cy Ａ ｇ１ The tertiary carbon atom may be, together with the tertiary carbon atom, a cyclopentane skeleton, a cyclohexane skeleton, a cycloheptane skeleton, a cyclooctane skeleton, a cyclononane skeleton, a cyclodecane skeleton, a cyclododecane skeleton, a cyclopentene skeleton, a cyclohexene skeleton, a cycloheptene skeleton, a cyclooctene skeleton, a cyclodecene skeleton, a norbornane skeleton, an adamantane skeleton, a tricyclodecane skeleton, a tetracyclododecane skeleton, a norbornene skeleton, or a tricyclodecene skeleton, and the divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２It is preferably one which may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0058] A tertiary carbon-type acid-dissociable group G represented by general formula (g-1-1): Ａ１ Examples of the tertiary carbon-type acid-dissociable group include the following:

[0059]

[0060]

[0061]

[0062] <<Tertiary carbon-type acid-dissociable group G represented by general formula (g-1-2) Ａ２ >> In the above general formula (g-1-2), R Ａ ｇ２１ ~R Ａ ｇ２３ are each independently a hydro group or an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), R Ａ ｇ２１ and R Ａ ｇ２２ , and / or R Ａ ｇ２２ and R Ａ ｇ２３ are directly connected to each other by a single bond or are divalently connected to each other by -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring.

[0063] R Ａ ｇ２１ and R Ａ ｇ２２ , and / or R Ａ ｇ２２ and R Ａｇ２３ Examples of the case where R 1 forms a ring together with the carbon atom contained in the ethylenically unsaturated double bond include the case where R 1 forms a cyclopentenyl group, a cyclohexenyl group, a cyclopentylideneethenyl group, a cyclohexylideneethenyl group, or the like, which may have a substituent.

[0064] Also Cy Ａ ｇ２ represents a C which may have a substituent together with the tertiary carbon atom. ３－１８ An alicyclic group or a 3- to 18-membered non-aromatic heterocyclic group is formed, and any divalent carbon atom is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0065] Cy Ａ ｇ２ The tertiary carbon atom may be, together with the tertiary carbon atom, a cyclopentane skeleton, a cyclohexane skeleton, a cycloheptane skeleton, a cyclooctane skeleton, a cyclononane skeleton, a cyclodecane skeleton, a cyclododecane skeleton, a cyclopentene skeleton, a cyclohexene skeleton, a cycloheptene skeleton, a cyclooctene skeleton, a cyclodecene skeleton, a norbornane skeleton, an adamantane skeleton, a tricyclodecane skeleton, a tetracyclododecane skeleton, a norbornene skeleton, or a tricyclodecene skeleton, and the divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, NHCO-, -S-, or -SO ２ It is preferably one which may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0066] A tertiary carbon-type acid-dissociable group G represented by general formula (g-1-2): Ａ２ Examples of the tertiary carbon-type acid-dissociable group include the following:

[0067]

[0068] <Allyl or benzyl acid-dissociable group G ＢThe acid-dissociable group G is an allyl or benzyl acid-dissociable group G represented by the following general formula (g-2): Ｂ An acid-labile group in which the carbon atom directly bonded to the polar group is at an allylic or benzyl position, such as:

[0069] "R Ｂ ｇ１ " is an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0070] R Ｂ ｇ１ As the C １－１２ Alkyl group, C ３－１２ Alicyclic group, C ６－１２ an aryl group, or C ７－１２ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１２ an alkyl group or C ３－１２ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0071] Also, "R Ｂ ｇ２ " ~ "R Ｂ ｇ４ " are each independently a hydro group or an optionally substituted C １－１２In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0072] R Ｂ ｇ１ and R Ｂ ｇ２ , R Ｂ ｇ２ and R Ｂ ｇ３ , and / or R Ｂ ｇ３ and R Ｂ ｇ４ are directly connected to each other by a single bond or are divalently connected to each other by -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring.

[0073] An allyl or benzyl acid-dissociable group G represented by general formula (g-2): Ｂ In this case, R Ｂ ｇ１ and R Ｂ ｇ２ , R Ｂ ｇ２ and R Ｂ ｇ３ , and / or R Ｂ ｇ３ and R Ｂ ｇ４ forms a ring together with the carbon atom contained in the ethylenically unsaturated double bond, and examples thereof include a cyclopentenyl group, a cyclohexenyl group, a cyclopentylideneethenyl group, a cyclohexylideneethenyl group, a benzyl group, or a 2,3-dihydro-1H-indanyl group, which may have a substituent.

[0074] An allyl or benzyl acid-dissociable group G represented by general formula (g-2): Ｂ Examples of the acid-dissociable group include the following allyl or benzyl acid-dissociable groups:

[0075]

[0076] <Acetal-type acid-dissociable group G Ｃ The acid-dissociable group G is an acetal-type acid-dissociable group G represented by the following general formula (g-3): Ｃ An acid-dissociable group in which an oxygen atom is bonded to a carbon atom directly bonded to a polar group, such as

[0077] "R Ｃ ｇ１ " and "R Ｃ ｇ３ " are each independently a hydro group or an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0078] R Ｃ ｇ１ and R Ｃ ｇ３ is a hydro group or a C １－１２ Alkyl group or C ３－１２ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－６ Alkyl group or C ３－８ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0079] Also, "R Ｃｇ２ " is an optionally substituted C １－１２ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0080] R Ｃ ｇ２ As the C １－１２ Alkyl group or C ３－１２ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－６ Alkyl group or C ３－８ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atoms may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0081] An acetal-type acid-dissociable group G represented by general formula (g-3): Ｃ Examples of the alkoxy group include a methoxymethoxy group, an ethoxymethoxy group, an n-propoxymethoxy group, an n-butoxymethoxy group, a 2,2-dimethylpropoxymethoxy group, a 2,2-dimethylbutoxymethoxy group, a cyclohexyloxymethoxy group, a 1-ethoxyethoxy group, a 1-n-butoxyethoxy group, and a 1-cyclohexyloxyethoxy group.

[0082] As used herein, the term "hydroxy group or carboxy group having a protecting group" refers to a hydroxy group (including a phenolic hydroxy group) or a carboxy group that is protected with an ether-based protecting group, a silyl ether-based protecting group, an acyl-based protecting group, an aminocarbonyl-based protecting group, or the like.

[0083] The ether-based protecting group is not particularly limited, and examples thereof include a methyl group, a benzyl group, a p-methoxybenzyl group, a t-butyl group, a triphenylmethyl group, a p-methoxyphenyldiphenylmethyl group, and a di(p-methoxyphenyl)phenylmethyl group. The silyl ether-based protecting group is not particularly limited, and examples thereof include a t-butyldimethylsilyl group (TBS), a triisopropylsilyl group (TIPS), a trimethylsilyl group (TMS), a triethylsilyl group (TES), and a t-butyldiphenylsilyl group (TBDPS). The acyl-based protecting group is not particularly limited, and examples thereof include an acetyl group, a pivaloyl group, and a benzoyl group. The aminocarbonyl-based protecting group is not particularly limited, and examples thereof include a dimethylaminocarbonyl group, a diethylaminocarbonyl group, a diisopropylaminocarbonyl group, and an N-phenyl-N-methyl-aminocarbonyl group.

[0084] In this specification, the term "optionally having a substituent" is not particularly limited as long as it is chemically permissible and has the effect of the present invention. Examples of the "substituent" include (1) a halogen atom, (2) a haloalkyl group, (3) a hydroxy group, (4) a thiol group, (5) a nitro group, (6) a cyano group, (7) a carboxy group, (8) an amino group, (9) a sulfo group, (10) a vinyl group, (11) an allyl group, (12) a (meth)acryloyl group, (13) a (meth)acryloyloxy group, (14) a (meth)acrylamide group, (15) a styryl group, (16) an epoxy group, (17) a glycidyl group, (18) an amide group, (19) a hydroxy group or a carboxy group having a protecting group, (20) a polar group having an acid-dissociable group, or (21) a C group in which at least a part of the hydrogen atoms may be substituted with the above (1) to (20). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C１－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ Hydrocarbyloxycarbonyloxy group, C １－１８ Hydrocarbylamino group, diC １－１８ Hydrocarbylamino group, C １－１８ Hydrocarbylaminocarbonyl group, diC １－１８ Hydrocarbylaminocarbonyl group, C １－１８ Hydrocarbylcarbonylamino group, C １－１８ Hydrocarbylaminocarbonyloxy group, diC １－１８ Hydrocarbylaminocarbonyloxy group, C １－１８ Hydrocarbylaminocarbonylamino group, diC １－１８ Hydrocarbylaminocarbonylamino group, C １－１８ Hydrocarbyloxycarbonylamino group, C １－１８ Hydrocarbylthio group, C １－１８ Hydrocarbylsulfinyl group, C １－１８ A hydrocarbylsulfonyl group, in which a divalent carbon atom at any position except the terminal of the substituent is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time), etc.

[0085] [1. Resist Material] The resist material according to this embodiment contains (A) a polyacid salt represented by general formula (I) or a mixture thereof, and (B) an acid diffusion controller. ｍ＋ ) ａ (B ｎ＋ ) ｂ (C （ａｍ＋ｂｎ）－ ) (I) [wherein A ｍ＋ are each independently H ＋ , a metal ion, or an ammonium ion; B ｎ＋ each independently represents an onium cation or dication having one or more polar groups having an acid-dissociable group;（ａｍ＋ｂｎ）－ represents an isopolyacid anion or a heteropolyacid anion; m is an integer of 1 to 5, n is an integer of 1 or 2, a is a real number, and b is a real number greater than 0.

[0086] [1-1. (A) Polyacid Salt or Mixture Thereof] As the (A) polyacid salt or mixture thereof, a polyacid salt represented by the above general formula (I) or a mixture thereof can be used. The anion moiety of the polyacid salt or mixture thereof is composed of an isopolyacid anion or a heteropolyacid anion. Furthermore, the cation moiety of the polyacid salt or mixture thereof is composed of an onium cation or onium dication having one or more polar groups having an acid-dissociable group.

[0087] [1-1-1. Anion Moiety of Polyacid Salt or Mixture Thereof] As the anion moiety of the polyacid salt or mixture thereof according to this embodiment, either an isopolyacid anion or a heteropolyacid anion may be used.

[0088] [1-1-1-1. Isopolyacid Anion] The isopolyacid anion according to this embodiment is not particularly limited, and examples thereof include an isopolyoxomolybdate anion, an isopolyoxotungstate anion, an isopolyoxovanadate anion, an isopolyoxoniobate anion, and an isopolyoxotantalate anion.

[0089] Examples of the isopolyoxomolybdate anion include [MoO ４ ] ２－ , [Mo ７ O ２４ ] ６－ , [Mo ８ O ２６ ] ４－ Examples of the isopolyoxotungstate anion include [W ４ O １３ ] ２－ , [W ５ O １６ ] ２－ , [W ６ O １９ ] ２－ , [W ７ O ２２ ] ２－ , [W７ O ２４ ] ６－ , [H ｚ W １２ O ４０ ] －（８－ｚ） (wherein z represents an integer of 1 to 4), [W １０ O ３２ ] ４－ , [H ４ W １１ O ３８ ] ６－ , [H ７ W １１ O ４０ ] ７－ , [HW ５ O １９ ] ７－ , [H ３ W １１ O ２２ ] ５－ Examples of the isopolyoxovanadate anion include [V ４ O １２ ] ４－ , [V １０ O ２８ ] ６－ Examples of the isopolyoxoniobate anion include [Nb ６ O １９ ] ８－ , [Nb １０ O ２８ ] ６－ Examples of the isopolyoxotantalate anion include [Ta ６ O １９ ] ８－ , [Ta ８ O ２１ ] ２－ etc.

[0090] The above-mentioned isopolyoxomolybdate anion, isopolyoxotungstate anion, isopolyoxovanadate anion, isopolyoxoniobate anion, and isopolyoxotantalate anion include various isomers.

[0091] The isopolyoxotungstate anion may be selected from the group consisting of [W ４ O １３ ] ２－ , [W ５O １６ ] ２－ , [W ６ O １９ ] ２－ , [W ７ O ２２ ] ２－ , [W ７ O ２４ ] ６－ , [W １０ O ３２ ] ４－ , [H ｚ W １２ O ４０ ] －（８－ｚ） (wherein z represents an integer of 1 to 4), [H ４ W １１ O ３８ ] ６－ , [H ７ W １１ O ４０ ] ７－ , [HW ５ O １９ ] ７－ , [H ３ W １１ O ２２ ] ５－ , [H ４ W ２２ O ７４ ] １２－ , or [H １０ W ３４ O １１６ ] １８－ It is preferable that [W ６ O １９ ] ２－ , [W ７ O ２４ ] ６－ , [W １０ O ３２ ] ４－ , [H ｚ W １２ O ４０ ] －（８－ｚ） (where z represents an integer of 1 to 4), and more preferably [W ６ O １９ ] ２－ , [W ７ O ２４ ] ６－ , [W １０ O ３２ ] ４－ , [H ２ W１２ O ４０ ] ６－ , [H ３ W １２ O ４０ ] ５－ It is more preferable that:

[0092] [1-1-1-2. Heteropolyacid Anion] Examples of the heteropolyacid anion according to this embodiment include heteropolyoxomolybdate anion, heteropolyoxotungstate anion, heteropolyoxovanadate anion, heteropolyoxoniobate anion, heteropolyoxotantalate anion, etc. The polyatom of the heteropolyacid anion is preferably Mo, W, V, Nb, or Ta, and more preferably Mo or W.

[0093] Examples of the heteropolyoxomolybdate anion include phosphomolybdate anion, silicomolybdate anion, boromolybdate anion, sulfur molybdate anion, phosphotungstomolybdate anion, cobalt molybdate anion, arsenic molybdate anion, germanium molybdate anion, etc. Examples of the heteropolyoxotungstate anion include phosphotungstate anion, silicotungstate anion, borotungstate anion, sulfur tungstate anion, cobalt tungstate anion, arsenic tungstate anion, germanium tungstate anion, etc. Examples of the heteropolyoxovanadate anion include phosphomolybdovanadate anion, boromolybdovanadate anion, boromolybdotungstovanadate anion, etc. The heteroatom of the heteropolyacid anion is preferably P, Si, Ge, B, S, Co or As, and more preferably P, Si, B, S or Ge.

[0094] The heteropolyoxomolybdate anion, heteropolyoxotungstate anion, heteropolyoxovanadate anion, etc. include Keggin type, Dawson type, Anderson type, and isomers thereof.

[0095] The heteropolyoxotungstate anion may be [PW １２ O ４０ ] ３－ , [SiW １２ O ４０ ] ４－ , [B.W. １２ O ４０ ] ５－ , [SW １２ O ４０ ] ２－ , [P ２ W １８ O ６２ ] ６－ , [Si ２ W １８ O ６２ ] ８－ It is preferable that:

[0096] [1-1-2. Cation Moiety of Polyacid Salt or Mixture Thereof] The cation moiety of the polyacid salt or mixture thereof according to this embodiment includes an onium cation or onium dication (B ｎ＋ The onium cation or onium dication having one or more polar groups having an acid-dissociable group preferably functions as a photoacid generator and changes its solubility in a developer by the action of an acid. The cation moiety of the polyacid salt or a mixture thereof may preferably contain other counter cations (A ｍ＋ ) may be included.

[0097] [1-1-2-1. Onium cation or onium dication having one or more polar groups having an acid dissociable group (B ｎ＋ ) ] As the onium cation or onium dication having one or more polar groups having an acid dissociable group according to this embodiment, an organic sulfonium cation, organic sulfonium dication, or organic iodonium cation having one or more polar groups having an acid dissociable group can be used.

[0098] [1-1-2-1-1. Organic sulfonium cation having one or more polar groups having an acid-dissociable group] The organic sulfonium cation having one or more polar groups having an acid-dissociable group is not particularly limited, and known and commonly used ones can be used. Examples of the organic sulfonium cation having one or more polar groups having an acid-dissociable group include organic sulfonium cations represented by the following general formula (II-1):

[0099] In general formula (II-1), R １Ａ , R １Ｂ and R １Ｃ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, １Ａ , R １Ｂ and R １Ｃ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ , R １Ｂ and R １Ｃ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C１－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ one or more hydrogen atoms contained in (t) are replaced by a polar group having an acid-dissociable group, and further R １Ａ , R １Ｂ and R １Ｃ Any two of these are directly connected to each other by a single bond, or are divalent linking groups -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the sulfur atom in formula (II-1).

[0100] R having one or more polar groups having the above acid-dissociable group １Ａ As the C １－１８ is a hydrocarbyl group; １Ａ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ In the formula (I), at least one hydrogen atom is replaced by a polar group having an acid-dissociable group, and C １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ an aralkyl group; １ＡThe divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ In the formula (I), at least one hydrogen atom is replaced by a polar group having an acid-dissociable group (t), and C ６－１８ Aryl group or C ７－１８ an aralkyl group; １Ａ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ａ More preferably, at least one hydrogen atom of the formula (I) is replaced by a polar group having an acid-dissociable group.

[0101] The above R １Ａ is characterized by having one or more polar groups having an acid-dissociable group, and for example, a polar group such as a hydroxy group, a carboxy group, an amino group, or a sulfo group having an acid-dissociable group is introduced. Examples of the acid-dissociable group include a tertiary carbon-type acid-dissociable group G Ａ , an allyl or benzyl acid-dissociable group G Ｂ , acetal-type acid-dissociable group G Ｃ etc.

[0102] R having one or more polar groups having the above acid-dissociable group １Ａ Examples of such groups include the following: where * denotes the bond to the sulfur atom in general formula (II-1).

[0103]

[0104] R １Ｂ and R １Ｃ Each of the C groups independently has a substituent. １－１８ is a hydrocarbyl group;１Ｂ and R １Ｃ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ｂ and R １Ｃ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ an aralkyl group; １Ｂ and R １ＣThe divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); １Ｂ and R １Ｃ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0105] Also R １Ａ , R １Ｂ and R １Ｃ Any two of these are directly connected to each other by a single bond, or are divalent linking groups -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C１－３ Examples of the case where R is linked via an alkylene group to form a ring together with the sulfur atom in formula (II-1) include those having a thian-1-ium skeleton, a thiophen-1-ium skeleton, a 1,4-oxathiane-4-ium skeleton, a 1,4-dithian-1-ium skeleton, a 1H-thiophen-1-ium skeleton, a benzo[b]thiophen-1-ium skeleton, a dibenzothiophenium skeleton, a 9,10-dihydrothioxanthylium skeleton, a 10H-phenoxathiane-10-ium skeleton, and a 5H-thianthren-5-ium skeleton, and the following can be mentioned as examples. Note that * indicates that R is not involved in ring formation. １Ａ , R １Ｂ or R １Ｃ It means the junction with.

[0106]

[0107] Examples of the organic sulfonium cation having one or more polar groups having an acid-dissociable group include (3,5-dimethyl-4-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethoxy)phenyl)diphenylsulfonium cation, (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium cation, (3,5-dimethyl-4-(2-((1-methylcyclopentyl)oxy)-2-oxoethoxy)phenyl)diphenylsulfonium cation, (2-(2-methyladamantan-2-yl)oxy)-2-oxoethoxy)phenyl)diphenylsulfonium cation, 5-(2-(t-butoxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium cation, (3,5-dimethyl-4-(2-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethoxy)-2-oxoethoxy)phenyl)diphenylsulfonium cation, 5-(3,5-dimethyl-4-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethoxy)phenyl)diphenylsulfonium cation (4-(2-((1-ethylcyclohexyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium cation, 1-(4-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethoxy)naphthalen-1-yl)tetrahydro-1H-thiophen-1-ium cation, (4-(t-butoxy)-3,5-dimethylphenyl)diphenylsulfonium cation, -((diisopropylcarbamoyl)oxy)phenyl)dimethylsulfonium cation, 1-(4-methoxymethoxy)naphthalen-1-yl)tetrahydro-1H-thiophen-1-ium cation, 1-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethyl)tetrahydro-1H-thiophen-1-ium cation, 1-(2-((2-methyladamantan-2-yl)oxy)-2-oxoethyl)hexahydrothiopyrylium cation, and the like.

[0108] Examples of the organic sulfonium cation having one or more polar groups having an acid-dissociable group include the following.

[0109]

[0110] [1-1-2-1-2. Organic sulfonium dication having one or more polar groups having an acid-dissociable group] The organic sulfonium dication having one or more polar groups having an acid-dissociable group is not particularly limited, and known and commonly used organic sulfonium dications can be used. Examples of the organic sulfonium dication having one or more polar groups having an acid-dissociable group include organic sulfonium dications represented by the following general formula (II-2):

[0111] In general formula (II-2), R ２Ａ , R ２Ｂ , R ２Ｃ and R ２Ｄ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, ２Ａ , R ２Ｂ , R ２Ｃ and R ２Ｄ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); K ２Ａ , K. ２Ｂ and L ２ each independently represents a C １－１８ represents a hydrocarbylene group, ２Ａ , K. ２Ｂ and L ２ The divalent carbon atom at any position in ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ２Ａ , R ２Ｂ , R ２Ｃ , R ２Ｄ , K. ２Ａ , K. ２Ｂ and L ２The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ A divalent carbon atom at any position excluding the terminal of these substituents may be replaced by -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ２Ａ , R ２Ｂ , R ２Ｃ , R ２Ｄ , K. ２Ａ , K. ２Ｂ and L ２ At least one hydrogen atom contained in R is replaced by (t) a polar group having an acid-dissociable group; ２Ａ , R ２Ｂ and K. ２Ａ and / or R ２Ｃ , R ２Ｄ and K. ２Ｂ Any two of these are directly connected to each other by a single bond, or are connected to each other by a divalent linking group -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C１－３ They may be linked via an alkylene group to form a ring together with the sulfur atom in formula (VIII).

[0112] The above R ２Ａ ~R ２Ｄ Each of the C groups independently has a substituent. １－１８ is a hydrocarbyl group; ２Ａ ~R ２Ｄ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ２Ａ ~R ２Ｄ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２- (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ an aralkyl group; ２Ａ ~R ２Ｄ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ２Ａ ~R ２Ｄ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0113] Above K ２Ａ , K. ２Ｂ and L ２ Each of the C groups independently has a substituent. １－１８ Alkylene group or C １－１８ represents an arylene group; ２Ａ , K. ２Ｂ and L ２ The divalent carbon atom at any position in ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); ２Ａ , K. ２Ｂ and L ２ Preferably, the hydrogen atoms contained in the above may be substituted with (a) a halogen atom, (b) a haloalkyl group, (c) a hydroxy group, (d) a thiol group, (e) a nitro group, (f) a cyano group, (g) a carboxy group, (h) an amino group, (i) a sulfo group, (j) a vinyl group, (k) an allyl group, (l) a (meth)acryloyl group, (m) a (meth)acryloyloxy group, (n) a (meth)acrylamide group, (o) a styryl group, (p) an epoxy group, (q) a glycidyl group, (r) an amide group, (s) a hydroxy group or carboxy group having a protecting group, or (t) a polar group having an acid-dissociable group.

[0114] R having one or more polar groups having an acid-dissociable group ２Ａ , R ２Ｂ , R ２Ｃ , R ２Ｄ , K. ２Ａ , K. ２Ｂ and / or L ２ Examples of the acid dissociable group include those into which a polar group such as a hydroxy group, a carboxy group, an amino group, or a sulfo group having an acid dissociable group has been introduced. Ａ , an allyl or benzyl acid-dissociable group G Ｂ , acetal-type acid-dissociable group GＣ R having one or more polar groups having the above acid-dissociable group ２Ａ ~R ２Ｄ As the R １Ａ Examples of the same can be given as examples.

[0115] [1-1-2-1-3. Organic iodonium cation having one or more polar groups having an acid-dissociable group] The organic iodonium cation having one or more polar groups having an acid-dissociable group is not particularly limited, and known and commonly used organic iodonium cations can be used. Examples of organic iodonium cations having one or more polar groups having an acid-dissociable group include organic iodonium cations represented by the following general formula (II-3):

[0116] In general formula (II-3), R ３Ａ and R ３Ｂ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, ３Ａ and R ３Ｂ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ａ and R ３ＢThe hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ a hydrocarbyloxycarbonyl group, or C １－１８ The divalent carbon atom at any position of these substituents, excluding the terminals, may be substituted with a hydrocarbyloxycarbonyloxy group, and may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S-, or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ａ one or more hydrogen atoms contained in (t) are replaced by a polar group having an acid-dissociable group, and further R ３Ａ and R ３Ｂ are directly connected to each other by a single bond, or are connected to each other by a divalent linking group, -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the iodine atom in formula (II-3).

[0117] R having one or more polar groups having the above acid-dissociable group ３Ａ The C １－１８ is a hydrocarbyl group; ３ＡThe divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ａ In the formula (I), at least one hydrogen atom is replaced by a polar group having an acid-dissociable group, and C １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ an aralkyl group; ３Ａ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ａ In the formula (I), at least one hydrogen atom is replaced by a polar group having an acid-dissociable group (t), and C ６－１８ Aryl group or C ７－１８ an aralkyl group; ３Ａ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ａ More preferably, at least one hydrogen atom of the formula (I) is replaced by a polar group having an acid-dissociable group.

[0118] The above R ３Ａ is characterized by having one or more polar groups having an acid-dissociable group, and for example, a polar group such as a hydroxy group, a carboxy group, an amino group, or a sulfo group having an acid-dissociable group is introduced. Examples of the acid-dissociable group include a tertiary carbon-type acid-dissociable group G Ａ, an allyl or benzyl acid-dissociable group G Ｂ , acetal-type acid-dissociable group G Ｃ R having one or more polar groups having the above acid-dissociable group ３Ａ As the R １Ａ Examples of the same can be given as examples.

[0119] R ３Ｂ As the C １－１８ is a hydrocarbyl group; ３Ｂ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ｂ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ an aralkyl group; ３Ｂ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced); ３Ｂ The hydrogen atoms contained in the formula (I) are selected from the group consisting of (a) halogen atoms, (b) haloalkyl groups, (c) hydroxy groups, (d) thiol groups, (e) nitro groups, (f) cyano groups, (g) carboxy groups, (h) amino groups, (i) sulfo groups, (j) vinyl groups, (k) allyl groups, (l) (meth)acryloyl groups, (m) (meth)acryloyloxy groups, (n) (meth)acrylamide groups, (o) styryl groups, (p) epoxy groups, (q) glycidyl groups, (r) amide groups, (s) hydroxy groups or carboxy groups having a protecting group, (t) polar groups having an acid-dissociable group, or (u) C groups in which at least a portion of the hydrogen atoms may be substituted with any of the above (a) to (t). １－１８ Hydrocarbyl group, C １－１８ Hydrocarbyloxy group, C １－１８ Hydrocarbyl carbonyl group, C １－１８ Hydrocarbylcarbonyloxy group, C １－１８ Hydrocarbyloxycarbonyl group, C １－１８ a hydrocarbyloxycarbonyloxy group, or C １－１８The divalent carbon atom at any position of these substituents, excluding the terminals, may be replaced by a hydrocarbylthio group, and may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —NH(C═O)O—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0120] [1-1-2-2. Other counter cations (A ｍ＋ Other counter cations according to this embodiment (A ｍ＋ ) is H ＋ , a metal ion, or an ammonium ion. ｍ＋ The metal ions that can be used as " are not particularly limited, and examples thereof include Li ＋ , Na ＋ , K. ＋ , Rb ＋ , Cs ＋ , Be ２＋ , Mg ２＋ , Ca ２＋ , Sr ２＋ , Ba ２＋ , Al ３＋ , Co ３＋ , Bi ３＋ , Zr ４＋ , Hf ４＋ , Bi ５＋ These metal ions may be used alone or in combination of two or more.

[0121] "A ｍ＋ "H ＋ , Li ＋ , Na ＋ , K. ＋ , Rb ＋ , Cs ＋ , Mg ２＋ , Ca ２＋ , Sr ２＋ , Ba ２＋ , Al ３＋ , Co ３＋ , N.H. ４＋ is preferred, and H ＋ , Na ＋ , K. ＋ , Rb ＋ , Cs＋ , Ca ２＋ , Al ３＋ , Co ３＋ , N.H. ４＋ is more preferred.

[0122] [1-1-2-3. A ｍ＋ and B ｎ＋ In general formula (I), m is an integer of 1 to 5, n is an integer of 1 or 2, a is a real number, and b is a real number greater than 0. (A ｍ＋ ) ａ (B ｎ＋ ) ｂ (C （ａｍ＋ｂｎ）－ ) (I) The mixture of polyacid salts also contains A ｍ＋ and B ｎ＋ In this case, the values ​​of a and b can be determined by, for example, NMR analysis, XRF analysis, XPS analysis, or the like.

[0123] The ratio of a to b is as follows: ｍ＋ , B ｎ＋ Although it depends on the types of compounds, a:b is preferably 0-3:3-12, more preferably 0-2:2-8, and even more preferably 0-1:1-4. In particular, when the value of am+bn is an integer of 2 to 8 and m and n are 1, it is preferable that a is a real number of 0 to 3 and b is a real number of 1 to 7, and it is more preferable that a is a real number of 0 to 2 and b is a real number of 2 to 7.

[0124] [1-2. (B) Acid Diffusion Controller] The resist material according to this embodiment contains (A) a polyacid salt or a mixture thereof, as well as (B) an acid diffusion controller that traps acid generated by exposure.

[0125] The acid diffusion controller is not particularly limited, and any known or commonly used acid diffusion controller can be used. Examples of the acid diffusion controller include (B1) a photodecomposable base that decomposes upon exposure to light and loses its acid diffusion control ability, and (B2) a nitrogen-containing organic compound that does not fall under the category of component (B1). These may be used alone or in combination of two or more.

[0126] [1-2-1. (B1) Photodegradable base] The photodegradable base (B1) loses its ability to control acid diffusion by decomposing upon exposure, but acts as a quencher in unexposed areas, thereby controlling acid diffusion. Therefore, by incorporating the photodegradable base (B1) into a resist material, it is possible to improve properties such as increasing sensitivity, reducing roughness, and suppressing the occurrence of coating defects.

[0127] The photodegradable base is not particularly limited, and any known or commonly used base can be used. Examples of the photodegradable base include "carboxylate compound B" represented by the following general formula (III-1): Ａ ", "sulfonate compound B" represented by the following general formula (III-2) Ｂ ", "sulfonylamide salt compound B represented by the following general formula (III-3) Ｃ ", etc. In the following, carboxylate anions, sulfonate anions, sulfonylamide anions, onium cations or dications (D ｐ＋ ) will be explained below.

[0128] [1-2-1-1. Carboxylate compound B Ａ The photodegradable base (B1) is a carboxylate compound B represented by the following general formula (III-1): Ａ ", a carboxylate anion and an onium cation or dication (D ｐ＋ ) can be used as a salt.

[0129] "R Ａ ｂ１ " is an optionally substituted C １－１８ A hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, in which any divalent carbon atom excluding the terminal carbon atom is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -S-, or -SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0130] R Ａ ｂ１ As the C １－１８ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0131] <Carboxylate Compound B Ａ１ Carboxylate compound B represented by the above general formula (III-1) Ａ is a carboxylate compound B represented by the following general formula (III-1-1): Ａ１ may be.

[0132] "X Ａ " is an optionally substituted C １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0133] X Ａ As the C ３－１８ Alicyclic group, C ６－１８an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and ３－１８ an alicyclic group, or C ６－１８ In an aryl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0134] "L Ａ " is X Ａ and-COO － and a group linking L Ａ -1) to (L Ａ A linking group represented by the formula (I)-7) can be used. [In the formula, L Ａ ｂ１ and L Ａ ｂ２ represents a single bond or an optionally substituted C １－８ represents a hydrocarbylene group, and *1 represents X Ａ The connecting part with *2 is -COO － represents the connection between

[0135] L Ａ ｂ１ and L Ａ ｂ２ is a single bond or C which may have a substituent. １－８ Alkylene group or C ６－８ An arylene group is preferred, and C １－８ An alkylene group is more preferred.

[0136] <Examples of carboxylate anions> Carboxylate compound B Ａ or B Ａ１ The carboxylate anion is not particularly limited, and examples thereof include trifluoroacetate anion, pentafluoropropionate anion, 2-methoxyacetate anion, 2-methoxy-2-methylpropionate anion, 2-hydroxyacetate anion, 2-hydroxy-2-methylpropionate anion, 2-acetoxyacetate anion, adamantane-1-carboxylate anion, 9,10-dihydro-9,10-ethanoanthracene-11-carboxylate anion, 9,10-dihydro-9,10-[1,2]benzenoanthracene-9-carboxylate anion, benzoate anion, salicylate anion, 3-hydroxybenzoate anion, and 3-trifluoromethylbenzoate anion.

[0137]

[0138]

[0139]

[0140] [1-2-1-2. Sulfonate compound B Ｂ The photodegradable base (B1) is a sulfonate compound B represented by the following general formula (III-2): Ｂ ", a sulfonate anion and an onium cation or dication (D ｐ＋ ) can be used as a salt.

[0141] "R Ｂ ｂ１ " is an optionally substituted C １－１８ A hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, in which any divalent carbon atom excluding the terminal carbon atom is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -S-, or -SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0142] RＢ ｂ１ As the C １－１８ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0143] Sulfonate Compound B Ｂ１ Sulfonate compound B represented by the above general formula (III-2) Ｂ is a sulfonate compound B represented by the following general formula (III-2-1): Ｂ１ may be.

[0144] "X Ｂ " is an optionally substituted C １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0145] X Ｂ As the C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and ３－１８ an alicyclic group, or C ６－１８ In an aryl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0146] "L Ｂ " is X Ｂ and -SO ２ -O － and a group linking L Ｂ -1) to (L Ｂ A linking group represented by the formula (I)-7) can be used. [In the formula, L Ｂ ｂ１ and L Ｂ ｂ２ represents a single bond or an optionally substituted C １－８ represents a hydrocarbylene group, and *1 represents X Ｂ The connection part with *2 is -SO ２ -O － represents the connection between

[0147] L Ｂ ｂ１ and L Ｂ ｂ２ is a single bond or C which may have a substituent. １－８ Alkylene group or C ６－８ An arylene group is preferred, and C １－８ An alkylene group is more preferred.

[0148] <Examples of sulfonate anions> Sulfonate compound B Ｂ or B Ｂ１ The sulfonate anion is not particularly limited, and examples thereof include camphorsulfonate anion, (adamantan-1-yl)methanesulfonate anion, (adamantane-1-carbonyloxy)ethane-1-sulfonate anion, cyclohexanesulfonate anion, 2-(cyclohexanecarbonyloxy)ethane-1-sulfonate anion, bicyclo[2.2.1]heptane-2-sulfonate anion, benzenesulfonate anion, and 4-methylbenzenesulfonate anion.

[0149]

[0150] [1-2-1-3. Sulfonylamide salt compound B Ｃ The photodegradable base (B1) is a sulfonylamide salt compound B represented by the following general formula (III-3): Ｃ ", a sulfonyl amide anion and an onium cation or dication (D ｐ＋ ) can be used as a salt.

[0151] "R Ｃ ｂ１ " is an optionally substituted C １－１８ A hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, in which any divalent carbon atom excluding the terminal carbon atom is -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -S-, or -SO ２ - may be substituted (however, adjacent divalent carbon atoms are not substituted at the same time). Ｃ ｂ２ " is an optionally substituted C １－１８ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0152] R Ｃ ｂ１ As the C １－１８ In a hydrocarbyl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0153] R Ｃ ｂ２ As the C １－１８ Alkyl group, C ３－１８ In an alicyclic group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not simultaneously substituted), and １－１２ More preferably, it is a haloalkyl group, and C １－５ A fluorinated alkyl group is more preferred.

[0154] <Sulfonylamide salt compound B Ｃ１ Sulfonylamide salt compound B represented by the above general formula (III-3) Ｃ is a sulfonylamide salt compound B represented by the following general formula (III-3-1): Ｃ１may be.

[0155] "X Ｃ " is an optionally substituted C １－１８ Alkyl group, C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ may be replaced by - (provided that adjacent divalent carbon atoms are not replaced at the same time).

[0156] X Ｃ As the C ３－１８ Alicyclic group, C ６－１８ an aryl group, or C ７－１８ An aralkyl group in which any divalent carbon atom excluding the terminal carbon atom is —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ - (provided that adjacent divalent carbon atoms are not simultaneously replaced), and ３－１８ an alicyclic group, or C ６－１８ In an aryl group, any divalent carbon atom excluding the terminal carbon atom may be —O—, —C(═O)—, —C(═O)O—, —OCO—, —CONH—, —NHCO—, —S—, or —SO ２ It is more preferred that it may be substituted with - (provided that adjacent divalent carbon atoms are not substituted at the same time).

[0157] "L Ｃ " is X Ｃ and -N － -SO ２ -R Ｃ ｂ２ and a group linking L Ｃ -1) to (L Ｃ A linking group represented by the formula (I)-7) can be used. [In the formula, L Ｃ ｂ１ and L Ｃ ｂ２ represents a single bond or an optionally substituted C １－１２ represents a hydrocarbylene group, and *1 represents X Ｃ The connection part with *2 is -N － -SO ２ -R Ｃ ｂ２ represents the connection between

[0158] L Ｃ ｂ１ and L Ｃ ｂ２ is a single bond or C which may have a substituent. １－１２ Alkylene group, C １－１２ Cycloalkylene group or C ６－１２ An arylene group is preferred, and C １－８ Alkylene group or C １－８ A cycloalkylene group is more preferred.

[0159] <Examples of sulfonylamide anions> The above sulfonylamide salt compound B Ｃ or B Ｃ１The sulfonylamide anion is not particularly limited, and examples thereof include methyl((trifluoromethyl)sulfonyl)amide anion, i-propyl((trifluoromethyl)sulfonyl)amide anion, methacryloyloxy((trifluoromethyl)sulfonyl)amide anion, 2-(methacryloyloxy)ethyl((trifluoromethyl)sulfonyl)amide anion, cyclohexyl((trifluoromethyl)sulfonyl)amide anion, 2-((cyclopentanecarbonyl)oxy)ethyl((trifluoromethyl)sulfonyl)amide anion, 2-((cyclohexanecarbonyl)oxy)ethyl((trifluoromethyl)sulfonyl)amide anion, bicyclo[2.2.1 ]heptan-2-ylmethyl((trifluoromethyl)sulfonyl)amide anion, bicyclo[2.2.1]heptan-7-ylmethyl((trifluoromethyl)sulfonyl)amide anion, 2-((adamantane-1-carbonyl)oxy)ethyl((trifluoromethyl)sulfonyl)amide anion, 2-(adamantane-1-carboxamido)ethyl((trifluoromethyl)sulfonyl)amide anion, 2-(4-((adamantane-1-carbonyl)oxy)cyclohexyl)ethyl((trifluoromethyl)sulfonyl)amide anion, 4-((adamantane-1-carbonyl)oxy)phenyl((trifluoromethyl)sulfonyl)amide anion, and the like.

[0160]

[0161]

[0162]

[0163] [1-2-1-4. Onium cation or dication (D ｐ＋ The cation moiety of the photodegradable base (B1) is an onium cation or a dication D ｐ＋ Here, the "(D ｐ＋ ) １／ｐ", D represents an onium cation or dication, and p represents an integer of 1 or 2. The onium cation or dication is not particularly limited, and examples that can be used include organic sulfonium cations, organic sulfonium dications, organic iodonium cations, organic quaternary ammonium cations, organic quaternary ammonium dications, organic phosphonium cations, and organic phosphonium dications.

[0164] The onium cation or dication (D ｐ＋ As the sulfonium cation, for example, an organic sulfonium cation represented by the following general formula (IV-1) can be used.

[0165] In general formula (IV-1), R Ｄ １Ａ , R Ｄ １Ｂ and R Ｄ １Ｃ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, Ｄ １Ａ , R Ｄ １Ｂ and R Ｄ １Ｃ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); R Ｄ １Ａ , R Ｄ １Ｂ and R Ｄ １Ｃ Any two of these are directly connected to each other by a single bond, or are divalent linking groups -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the sulfur atom in formula (IV-1).

[0166] The onium cation or dication (D ｐ＋ As the cation (IV-1), for example, an organic sulfonium dication represented by the following general formula (IV-2) can be used.

[0167] In general formula (IV-2), R Ｄ ２Ａ , R Ｄ ２Ｂ , R Ｄ ２Ｃ and R Ｄ ２Ｄ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, Ｄ ２Ａ , R Ｄ ２Ｂ , R Ｄ ２Ｃ and R Ｄ ２Ｄ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); K Ｄ ２Ａ , K. Ｄ ２Ｂ and L Ｄ ２ each independently represents a C １－１８ represents a hydrocarbylene group, Ｄ ２Ａ , K. Ｄ ２Ｂ and L Ｄ ２ The divalent carbon atom at any position in ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); R Ｄ ２Ａ , R Ｄ ２Ｂand K. Ｄ ２Ａ and / or R Ｄ ２Ｃ , R Ｄ ２Ｄ and K. Ｄ ２Ｂ Any two of these are directly connected to each other by a single bond, or are connected to each other by a divalent linking group -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the sulfur atom in formula (IV-2).

[0168] The onium cation or dication (D ｐ＋ As the iodonium cation, for example, an organic iodonium cation represented by the following general formula (IV-3) can be used.

[0169] In general formula (IV-3), R Ｄ ３Ａ and R Ｄ ３Ｂ each independently represents a C １－１８ represents a hydrocarbyl group, a 3- to 18-membered non-aromatic heterocyclic group, or a 5- to 18-membered aromatic heterocyclic group, Ｄ ３Ａ and R Ｄ ３Ｂ The divalent carbon atom at any position excluding the terminal may be -O-, -C(=O)-, -C(=O)O-, -OCO-, -CONH-, -NHCO-, -NH(C=O)O-, -S- or -SO ２ - may be substituted (provided that adjacent divalent carbon atoms are not substituted at the same time); R Ｄ ３Ａ and R Ｄ ３Ｂ are directly connected to each other by a single bond, or are connected to each other by a divalent linking group, -O-, -S-, -C(=O)-, -S(=O)-, -S(=O) ２ -, -C(=O)O-, or C １－３ They may be linked via an alkylene group to form a ring together with the iodine atom in formula (IV-3).

[0170] [1-2-2. (B2) Nitrogen-Containing Organic Compound] As the other (B) acid diffusion controller, (B2) may be contained a nitrogen-containing organic compound that does not fall under (B1). The nitrogen-containing organic compound is not particularly limited, and examples thereof include aliphatic amines, aromatic amines, and heterocyclic amines.

[0171] Examples of nitrogen-containing organic compounds include aliphatic amines such as n-hexylamine, n-heptylamine, diethylamine, di-n-propylamine, di-n-butylamine, triethylamine, tri-n-propylamine, tri-n-butylamine, tri-n-pentylamine, and tri-n-octylamine; aromatic amines such as aniline, N-methylaniline, N-ethylamine, N,N-dimethylaniline, 4-methylaniline, and pyrrole; and heterocyclic amines such as pyridine, imidazole, benzimidazole, piperidine, piperazine, 1,5-diazabicyclo[4.3.0]-5-nonene, 1,8-diazabicyclo[5.4.0]-7-undecene, hexamethylenetetramine, and 1,4-diazabicyclo[2.2.2]octane. These nitrogen-containing organic compounds may be used alone or in combination of two or more.

[0172] [1-2-3. Amount] There are no particular limitations on the amount of acid diffusion controller (B) contained in the resist material according to this embodiment, and this can be selected appropriately depending on the amount and type of component (A). The amount of component (B) in the resist material is preferably 0.1 to 30 parts by mass, more preferably 0.2 to 25 parts by mass, and even more preferably 0.5 to 20 parts by mass, per 100 parts by mass of component (A).

[0173] [1-3. Organic Solvent] The resist material according to this embodiment may further contain an organic solvent. The organic solvent is not particularly limited, and any known or commonly used organic solvent can be used. The organic solvent is preferably an organic solvent that can uniformly dissolve or disperse (A) the polyacid salt or a mixture thereof and (B) the acid diffusion controller when they are prepared.

[0174] Examples of the organic solvent include polar solvents such as alcohol solvents, ether solvents, ketone solvents, amide solvents, ester solvents, nitrile solvents, and aprotic polar solvents, and nonpolar solvents such as hydrocarbon solvents. These organic solvents may be used alone or in combination of two or more.

[0175] Specific examples of the polar solvent include: alcohol-based solvents such as methanol, ethanol, isopropyl alcohol (IPA), diacetone alcohol (DAA), 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, 4-methyl-2-pentanol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and propylene glycol monomethyl ether (PGME); ether-based solvents such as diethyl ether, dipropyl ether, dibutyl ether, diisoamyl ether, tetrahydrofuran, anisole, propylene glycol monoethyl ether, ethylene glycol monomethyl ether, and ethylene glycol monoethyl ether; ketone-based solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, methyl-n-pentyl ketone, methyl isopentyl ketone, 2-heptanone, acetophenone, propylene carbonate, and furfural; Amide-based solvents such as N,N-dimethylformamide, N,N-diethylformamide, acetamide, N-methylpyrrolidone, 1-ethyl-2-pyrrolidone, and 1-butyl-2-pyrrolidone; ester-based solvents such as methyl lactate, ethyl lactate (EL), methyl acetate, ethyl acetate, methyl pyruvate, ethyl pyruvate, methyl methoxypropionate, and propylene glycol monomethyl ether acetate (PGMEA); nitrile-based solvents such as acetonitrile, propionitrile, and benzonitrile; aprotic polar solvents such as γ-butyrolactone, δ-valerolactone, γ-lactam, δ-lactam, dimethyl sulfoxide (DMSO), sulfolane, 1,3-dimethyl-2-imidazolidinone, and tetramethylurea; and nonpolar solvents such as hydrocarbon solvents such as n-pentane, n-hexane, toluene, and xylene. The above organic solvents may be used alone or in combination of two or more.

[0176] The organic solvent contained in the resist material according to this embodiment is preferably a polar solvent in terms of coatability, and more preferably an amide solvent, an ester solvent, an alcohol solvent, or a ketone solvent in terms of solubility. The amide solvent is preferably at least one selected from the group consisting of N,N-dimethylformamide, N,N-diethylformamide, acetamide, and N-methylpyrrolidone. Furthermore, the ester solvent or alcohol solvent preferably has an ester bond and / or a hydroxyl group in terms of solubility, and among the above, at least one selected from the group consisting of propylene glycol monomethyl ether, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, methyl pyruvate, ethyl pyruvate, and propylene glycol monomethyl ether acetate is preferred.

[0177] The amount of organic solvent in the resist material is not particularly limited and can be set appropriately depending on the method for applying the resist material to a substrate, the thickness of the applied film, etc. The amount of organic solvent in the resist material is preferably such that the solids concentration of the resist material is 0.01 to 20 mass%, more preferably 0.1 to 15 mass%, and even more preferably 0.2 to 10 mass%.

[0178] [1-4. Others] The resist material according to this embodiment may further contain, as desired, miscible additives, such as additional resins for improving the performance of the resist film, dissolution inhibitors, plasticizers, stabilizers, colorants, antihalation agents, dyes, etc. Preferably, the resist material according to this embodiment does not contain an epoxy resin. It is also preferable that the resist material does not contain hydrogen peroxide.

[0179] [2. Pattern Forming Method] The pattern forming method according to this embodiment includes the steps of applying a resist material to a substrate, exposing the resist film formed by the application step, and developing the exposed resist film.

[0180] [2-1. Coating Step] The pattern forming method according to this embodiment includes a step of coating a substrate with a resist material.

[0181] <Substrate> The substrate used in this embodiment is not particularly limited, and known and commonly used substrates can be used. For example, a substrate for electronic components or a substrate on which a predetermined wiring pattern is formed may be used. The material of the substrate is not particularly limited, and examples thereof include silicon wafers, metal substrates such as copper, chromium, iron, and aluminum, and inorganic substrates such as glass, titanium oxide, and silicon dioxide. The size, shape, and the like of the substrate are not particularly limited, and the surface of the substrate may be smooth, curved, or uneven, or may be a flake-shaped substrate.

[0182] The surface of the substrate may be subjected to a surface treatment as necessary. In the case of a substrate having hydroxyl groups on its surface layer, the surface of the substrate is treated with a silane coupling agent capable of reacting with the hydroxyl groups, thereby changing the surface layer of the substrate from hydrophilic to hydrophobic, thereby improving the adhesion between the substrate and the metal compound-containing film. Examples of the silane coupling agent include hexamethyldisilazane (HMDS).

[0183] <Coating Method> The method for applying the resist material onto the substrate is not particularly limited, and any known or commonly used method can be used. Examples of dry coating methods include CVD (chemical vapor deposition) methods such as thermal CVD, plasma CVD, and photo-CVD; and PVD (physical vapor deposition) methods such as vacuum deposition, plasma-assisted deposition, sputtering, and ion plating. Examples of wet coating methods include spin coating, bar coating, roll coating, flow coating, dip coating, spray coating, inkjet printing, and screen printing.

[0184] As a method for applying the resist material according to this embodiment to a substrate, a wet method such as spin coating or screen printing is preferably used, and spin coating is more preferable, from the viewpoint of forming a uniform film thickness, etc. After forming the coating film, a backside rinse, an edge bead removal step, etc. may be performed to remove the edge bead.

[0185] The method for drying the resist film formed by applying a resist material to a substrate is not particularly limited, and can be performed using, for example, a heating device such as a hot plate (post-applied bake (PAB)), a pressure reducing device, or the like. The baking conditions are not particularly limited, and can be set appropriately depending on the type of resist film, application, etc. The baking temperature is preferably 80 to 300°C, more preferably 80 to 200°C, and even more preferably 80 to 130°C. The baking time is preferably 10 to 300 seconds, more preferably 20 to 180 seconds, and even more preferably 30 to 120 seconds.

[0186] The thickness of the resist film after drying is not particularly limited, but is preferably 0.5 to 100 nm, more preferably 1 to 75 nm, and even more preferably 1 to 60 nm.

[0187] [2-2. Exposure Step] The pattern formation method according to this embodiment includes a step of exposing the resist film formed in the above-described coating step.

[0188] As an exposure apparatus in the exposure step of the resist film, for example, an ArF exposure apparatus, an electron beam lithography apparatus, an EUV exposure apparatus, etc. Furthermore, in the exposure step, exposure may be performed through a mask (mask pattern) on which a predetermined pattern is formed, or selective exposure may be performed by lithography using direct irradiation with an electron beam without using a mask pattern.

[0189] The wavelength used for exposure is not particularly limited, and examples thereof include ArF excimer laser (wavelength 193 nm), KrF excimer laser (248 nm), F ２ Radiation such as excimer laser (wavelength 157 nm), EUV (extreme ultraviolet), VUV (vacuum ultraviolet), EB (electron beam), X-ray, or soft X-ray may also be used.

[0190] The exposure dose on the resist film is 1 to 200 mJ / cm in the case of an ArF excimer laser or a KrF excimer laser. ２ is preferably 20 to 60 mJ / cm ２In the case of extreme ultraviolet rays, the exposure dose is, for example, 500 mJ / cm ２ or less, and 0.1 to 200 mJ / cm ２ is preferably 3 to 100 mJ / cm ２ More preferably, it is 5 to 50 mJ / cm ２ In the case of an electron beam, it is more preferable that the concentration is 3 μC / cm at 50 kV. ２ ~2mC / cm ２ It is preferable to expose with a dose of 10 μC / cm ２ ~1.5mC / cm ２ It is more preferable to expose at a dose of 1000 ppm.

[0191] After the resist film is exposed to light, it may or may not be baked (post-exposure bake (PEB)). The baking conditions are not particularly limited and can be set appropriately depending on the type of resist film, its intended use, etc. The baking temperature is preferably 80 to 300°C, more preferably 80 to 200°C, and even more preferably 80 to 130°C, using a heating device such as a hot plate. The baking time is preferably 10 to 300 seconds, more preferably 20 to 180 seconds, and even more preferably 30 to 120 seconds.

[0192] [2-3. Development Step] The pattern formation method according to this embodiment includes a step of developing the exposed resist film. In the development step, a pattern can be formed by developing the exposed resist film with a developer. A negative pattern formation process is one in which the exposed region remains as a pattern after development, while a positive pattern formation process is one in which the exposed region is removed after development. Whether a positive or negative pattern is formed can be appropriately selected depending on the resist material or the developer. After the development, the resist film may be washed with a rinse solution and then dried, and in some cases, a baking treatment may be further performed.

[0193] The developer used in this embodiment may be an alkaline developer for an alkaline development process, or a developer containing an organic solvent (organic developer) for an organic solvent development process.

[0194] <Alkaline Development Process> The alkaline developer used in the alkaline development process is not particularly limited, and any known or commonly used one can be used. Examples of the alkaline developer include aqueous solutions containing one or more of quaternary ammonium salts such as tetramethylammonium hydroxide and (2-hydroxyethyl)trimethylammonium hydroxide, inorganic alkalis such as sodium hydroxide and potassium hydroxide, and alkanolamines such as dimethylethanolamine and triethanolamine.

[0195] Furthermore, pure water can be used as a rinse liquid in the alkaline development process.

[0196] <Organic Solvent Development Process> Examples of developers used in the organic solvent development process include developers containing one or more organic solvents such as polar solvents, such as ketone-based solvents, ester-based solvents, alcohol-based solvents, nitrile-based solvents, amide-based solvents, and ether-based solvents, and hydrocarbon-based solvents.

[0197] Specific examples of organic solvents include: ketone-based solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, methyl-n-pentyl ketone, methyl isopentyl ketone, 2-heptanone, acetophenone, propylene carbonate, and furfural; ester-based solvents such as methyl lactate, ethyl lactate (EL), methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, ethyl pyruvate, methyl methoxypropionate, and propylene glycol monomethyl ether acetate (PGMEA); alcohol-based solvents such as methanol, ethanol, isopropyl alcohol (IPA), 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, 4-methyl-2-pentanol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and propylene glycol monomethyl ether (PGME); and nitrile-based solvents such as acetonitrile, propionitrile, and benzonitrile. Examples of the solvent include amide-based solvents such as N,N-dimethylformamide, N,N-diethylformamide, acetamide, N-methylpyrrolidone, 1-ethyl-2-pyrrolidone, and 1-butyl-2-pyrrolidone; ether-based solvents such as diethyl ether, dipropyl ether, dibutyl ether, diisoamyl ether, tetrahydrofuran, anisole, propylene glycol monoethyl ether, ethylene glycol monomethyl ether, and ethylene glycol monoethyl ether; and hydrocarbon-based solvents such as n-pentane, n-hexane, toluene, and xylene. These may be used alone or in combination of two or more.

[0198] Among these, the organic solvent used in the developer is preferably a polar solvent, and preferably contains an amide solvent, an alcohol solvent, or an ester solvent, and more preferably contains an amide solvent or an ester solvent and an alcohol solvent. The amide solvent is preferably at least one selected from the group consisting of N,N-dimethylformamide, N,N-diethylformamide, acetamide, and N-methylpyrrolidone. The ester solvent is preferably at least one selected from the group consisting of methyl lactate, ethyl lactate (EL), methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, ethyl pyruvate, methyl methoxypropionate, and propylene glycol monomethyl ether acetate. The alcohol solvent is preferably at least one selected from the group consisting of ethanol, isopropyl alcohol (IPA), 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, 4-methyl-2-pentanol, benzyl alcohol, and 4-methylbenzyl alcohol.

[0199] When the developer contains both an amide solvent or an ester solvent and an alcohol solvent, the blending ratio (weight ratio) of the amide solvent or the ester solvent to the alcohol solvent is preferably 5:95 to 95:5, and more preferably 10:90 to 90:10.

[0200] After development with the developer, a step of washing with a rinse liquid may be included. The rinse liquid is not particularly limited, and any known or commonly used liquid may be used. As the rinse liquid, water or an organic solvent contained in the developer that does not easily dissolve the resist pattern may be appropriately selected and used.

[0201] The rinse liquid is not particularly limited, and may be, for example, at least one organic solvent selected from the group consisting of hydrocarbon solvents, ketone solvents, ester solvents, alcohol solvents, amide solvents, and ether solvents. Among these, it is preferable to use at least one organic solvent selected from the group consisting of hydrocarbon solvents, ketone solvents, ester solvents, alcohol solvents, and amide solvents as the rinse liquid, it is more preferable to use at least one solvent selected from the group consisting of alcohol solvents and ester solvents, and it is even more preferable to use at least one alcohol solvent.

[0202] The alcohol-based solvent used in the rinse solution is preferably a monohydric alcohol having 2 to 8 carbon atoms, and the monohydric alcohol may be linear, branched, or cyclic. Specific examples of the monohydric alcohol include ethanol, isopropyl alcohol (IPA), butanol, 1-hexanol, 1-heptanol, 1-octanol, 2-hexanol, 2-heptanol, 2-octanol, 3-hexanol, 3-heptanol, 3-octanol, 4-octanol, and benzyl alcohol. These organic solvents may be used alone or in combination of two or more.

[0203] <Developing Method with Developer and Cleaning Method with Rinse Liquid> The method for developing the exposed resist film using the developer is not particularly limited, and any known or commonly used method can be used. Examples of the developing method using the developer include a method of immersing a substrate having an exposed resist film in the developer for a certain period of time (dipping method), a method of spraying the developer onto the surface of the exposed resist film (spray method), and a method of discharging the developer at a constant speed from a discharge nozzle toward the surface of the exposed resist film on a substrate rotating at a constant speed (dynamic dispensing method).

[0204] The method for cleaning the resist pattern with the rinse liquid is not particularly limited, and any known or commonly used method can be used. Examples of the cleaning method using the rinse liquid include a method of immersing the resist pattern in the rinse liquid for a certain period of time (dip method), a method of spraying the rinse liquid onto the surface of the resist pattern (spray method), and a method of discharging the rinse liquid at a constant speed from a discharge nozzle toward the surface of the resist pattern that is rotating at a constant speed (dynamic dispense method).

[0205] 3. Patterned Structure The patterned structure according to this embodiment can be obtained by forming a pattern of the resist material on a substrate using the pattern formation method described above.

[0206] The average thickness of part or all of the patterned structure according to this embodiment is not particularly limited and can be set appropriately depending on the intended use, etc. The patterned structure preferably has portions with an average thickness of 1 to 100 nm, more preferably 5 to 75 nm, and even more preferably 10 to 60 nm.

[0207] The pitch of part or all of the patterned structure according to this embodiment is not particularly limited and can be set appropriately depending on the purpose of use, etc. In the patterned structure, it is preferable to have a part with a pitch of 100 nm or less, more preferably a part with a pitch of 50 nm or less, and even more preferably a part with a pitch of 20 nm or less. By patterning the resist material according to this embodiment using the above-mentioned pattern formation method, it is possible to create parts with pitches of 50 nm, 20 nm, or 15 nm in part or all of the patterned structure.

[0208] [4. Resist Material for Electron Beam or EUV] The resist material according to this embodiment contains a polyacid salt or a mixture thereof, and uses an onium cation or dication having one or more polar groups containing an acid-dissociable group in the cation moiety of the polyacid salt or the mixture thereof, and the polyacid salt or the mixture thereof exhibits both the function of a photoacid generator and the function of changing the solubility in a developer by the action of an acid. Therefore, the resist material according to this embodiment has good sensitivity to electron beam and EUV light sources and can be suitably used as a resist material compatible with these exposure light sources.

[0209] EXAMPLES The present invention will be specifically explained below by showing examples, but the present invention is not limited to these examples.

[0210] [1. Synthesis of Polyacid Salts or Mixtures Thereof] Polyacid salts A-1 to A-5 were each synthesized by the following method.

[0211] <Synthesis Example 1: Tetrakis((4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium)silicate (Polyacid Salt (A-1))> 42.60 g of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride was dissolved in 50 g of cyclohexanone, and silicotungstic acid (H ４ [SiW １２ O ４０ ]・26H ２ 41.06 g of methyl 2-hydroxybenzoate (A-1) was added, and the reaction solution was stirred at room temperature for 2 hours. The reaction solution was filtered, and the obtained powder was dried under reduced pressure at room temperature for 18 hours. The dried powder was crystallized at room temperature using dichloromethane and acetonitrile to obtain the target compound, polyacid salt (A-1). １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 7.76-7.82 (m, 40H), 7.59 (s, 8H), 4.55 (s, 8 H), 2.29 (m, 24H), 1.90-1.93 (m, 16H), 1.48-1.75 (m, 24H), 0.77-0.81 (t, 12H). １８３W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -92.7 (s, 12 W). ESI-MS: NEGATIVE m / z 718.5 (median) ([SiW １２ O ４０ ] ４－ ) XPS analysis S:W (molar ratio of S to W) = 4:12

[0212] <Synthesis Example 2: Tris((4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium)phosphotungstate (Polyacid Salt (A-2))> The target compound, polyacid salt (A-2), was obtained in the same manner as in Synthesis Example 1, except that 41.97 g of phosphotungstic acid was used as the raw material compound instead of silicotungstic acid. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 7.76-7.82 (m, 30H), 7.59 (s, 6H), 4.55 (s, 6 H), 2.29 (m, 18H), 1.90-1.93 (m, 12H), 1.48-1.75 (m, 18H), 0.77-0.81 (t, 9H). １８３ W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -86.7 (s, 12 W). ESI-MS: NEGATIVE m / z 959 (median) ([PW １２ O ４０ ] ３－ ) XPS analysis S:W (molar ratio of S to W) = 3:12

[0213] <Synthesis Example 3: Tetrakis(triphenylsulfonium)silicone (polyacid salt (A-3))> The target compound, polyacid salt (A-3), was obtained in the same manner as in Synthesis Example 1, except that 25.61 g of triphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride as the raw material compound. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 7.74-7.90 (m, 60H). １８３W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -92.7 (s, 12 W). ESI-MS: NEGATIVE m / z 718.5 (median) ([SiW １２ O ４０ ] ４－ ) XPS analysis S:W (molar ratio of S to W) = 4:12

[0214] <Synthesis Example 4: Tris(triphenylsulfonium)phosphotungstate (polyacid salt (A-4))> In Synthesis Example 1, 19.21 g of triphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride as a raw material compound, and tungstophosphoric acid (H ３ [P.W. １２ O ４０ ]・30H ２ The target compound, polyacid salt (A-4), was obtained in the same manner as above, except that 41.97 g of methyl methyl acrylate (A-1) was used. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 7.74-7.90 (m, 45H) １８３ W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -86.7 (s, 12 W). ESI-MS: NEGATIVE m / z 959 (median) ([PW １２ O ４０ ] ３－ ) XPS analysis S:W (molar ratio of S to W) = 3:12

[0215] <Synthesis Example 5: Hexakis(triphenylsulfonium)metatungstate (polyacid salt (A-5))> In Synthesis Example 1, triphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride as a raw material compound, and ammonium metatungstate (ammonium metatungstate hydrate ((NH ４ ) ６ [H ２ W１２ O ４０ ]・xH ２ The target compound, polyacid salt (A-5), was obtained in the same manner as above, except that methyl methyl acrylate (A-1) was used instead. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 7.78-7.87 (m, 15H), 5.97 (s, 0.33H). １８３ W-NMR (20.84MHz, DMSO-D6): δ (ppm) = -100.13 (s, 12W). ESI-MS: POSITIVE m / z 263.1 ([C １８ H １５ S] ＋ ) NEGATIVE m / z 712.3 (median) ([H ４ W １２ O ４０ ] ４－ )

[0216] <Synthesis Example 6: Hexakis((4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium)metatungstate (Polyacid Salt (A-6))> In Synthesis Example 1, ammonium metatungstate (ammonium metatungstate hydrate (NH)) was used as a raw material compound instead of silicotungstic acid. ４ ) ６ [H ２ W １２ O ４０ ]・xH ２ The target compound, polyacid salt (A-6), was obtained in the same manner as above, except that methyl methyl acrylate (A-6) was used instead. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 0.77-0.81 (t, 3H), 1.48-1.75 (m, 6H), 1.90-1.93 (m, 4H), 2.29 (m, 6H), 4.55 (s, 2H), 5.97 (s, 0.33H), 7.59 (s, 2H), 7.76-7.82 (m, 10H). １８３ W-NMR (20.84MHz, DMSO-D6): δ (ppm) = -100.13 (s, 12W). ESI-MS: POSITIVE m / z 461.2 ([C ２９ H ３３ O ３ S]＋ ) NEGATIVE m / z 712.3 (median) ([H ４ W １２ O ４０ ] ４－ )

[0217] <Synthesis Example 7: Tetrakis((3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium)silicate (Polyacid Salt (A-7))> The target compound, polyacid salt (A-7), was obtained in the same manner as in Synthesis Example 1, except that (3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride as the raw material compound. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 1.49-1.97 (m, 68H), 2.31 (s, 24H), 4.62 (s, 8H), 7.61 (s, 8H), 7.75-7.86 (m, 40H). １８３ W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -92.7 (s, 12 W). ESI-MS: POSITIVE m / z 513.2 ([C ３３ H ３７ O ３ S] ＋ ) NEGATIVE m / z 718.5 (median) ([SiW １２ O ４０ ] ４－ ) XPS analysis S:W (molar ratio of S to W) = 4:12

[0218] <Synthesis Example 8: Tris((3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium)phosphotungstate (polyacid salt (A-8))> In Synthesis Example 1, as a raw material compound, (3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride, and phosphotungstic acid (H ３ [P.W. １２ O ４０ ]・30H ２ The target compound, polyacid salt (A-8), was obtained in the same manner as above, except that methyl methyl acrylate (A-1) was used instead. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 1.49-1.97 (m, 51H), 2.31 (s, 18H), 4.62 (s, 6H), 7.61 (s, 6H), 7.75-7.86 (m, 30H). １８３ W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -86.7 (s, 12 W). ESI-MS: POSITIVE m / z 513.2 ([C ３３ H ３７ O ３ S] ＋ ) NEGATIVE m / z 959 (median) ([PW １２ O ４０ ] ３－ ) XPS analysis S:W (molar ratio of S to W) = 3:12

[0219] <Synthesis Example 9: Hexakis((3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium)metatungstate (Polyacid Salt (A-9))> In Synthesis Example 1, as a raw material compound, (3,5-dimethyl-4-(2-methyladamantan-2-yloxycarbonylmethyloxy)phenyl)diphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride, and ammonium metatungstate (ammonium metatungstate hydrate ((NH ４) ６ [H ２ W １２ O ４０ ]・xH ２ The target compound, polyacid salt (A-9), was obtained in the same manner as above, except that methyl methyl acrylate (A-1) was used instead. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 1.49-1.97 (m, 17H), 2.31 (s, 6H), 4.62 (s, 2H), 5.97 (s, 0.33H), 7.61 (s, 2H), 7.75-7.86 (m, 10H). １８３ W-NMR (20.84MHz, DMSO-D6): δ (ppm) = -100.13 (s, 12W). ESI-MS: POSITIVE m / z 513.2 ([C ３３ H ３７ O ３ S] ＋ ) NEGATIVE m / z 712.3 (median) ([H ４ W １２ O ４０ ] ４－ )

[0220] <Synthesis Example 10: Tetrakis((4-(t-butyloxycarbonylmethyloxy)-3,5-dimethylphenyl)diphenylsulfonium)silicate (Polyacid Salt (A-10))> The target compound, polyacid salt (A-10), was obtained in the same manner as in Synthesis Example 1, except that (4-(t-butyloxycarbonylmethyloxy)-3,5-dimethylphenyl)diphenylsulfonium chloride was used instead of (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium chloride as the raw material compound. １ H-NMR (400MHz, DMSO-D6): δ (ppm) = 1.43 (s, 36H), 2.30 (s, 24H), 4.55 (s, 8H), 7.63 (s, 8H), 7.75-7.86 (m, 40H). １８３ W-NMR (20.84 MHz, DMSO-D6): δ (ppm) = -92.7 (s, 12 W). ESI-MS: POSITIVE m / z 421.2 ([C ２６ H ２９O ３ S] ＋ ) NEGATIVE m / z 718.5 (median) ([SiW １２ O ４０ ] ４－ ) XPS analysis S:W (molar ratio of S to W) = 4:12

[0221] [2. Preparation of Test Resist Materials] Test resist materials R-1 to R-13 were prepared by blending the polyacid salts (A-1) to (A-10) synthesized above, an acid diffusion controller, and an organic solvent in the amounts (unit: parts by mass) shown in Table 1 below.

[0222] The following (B-1) to (B-4) were used as the acid diffusion controllers (B) listed in Table 1: (B-1): Acid diffusion controller (B-1), which is a salt of salicylic acid anion and phenylbis(2-(trifluoromethyl)phenyl)sulfonium cation represented by the following formula, was used. (B-2): An acid diffusion controller (B-2) was used, which was a salt of salicylic acid anion and (4-(2-((1-ethylcyclopentyl)oxy)-2-oxoethoxy)-3,5-dimethylphenyl)diphenylsulfonium cation represented by the following formula: (B-3): An acid diffusion controller (B-3) was used, which was a salt of 2,6-dihydroxybenzoic acid anion and phenylbis(2-(trifluoromethyl)phenyl)sulfonium cation represented by the following formula: (B-4): An acid diffusion controller (B-4) was used, which was a salt of salicylic acid anion and triphenylsulfonium cation represented by the following formula:

[0223]

[0224] [3. Preparation of LS Pattern] Resist materials R-1 to R-13 were each applied using a spinner to an 8-inch silicon substrate that had been treated with hexamethyldisilazane (HMDS), and then post-applied bake (PAB) was performed on a hot plate at 120°C for 60 seconds, followed by drying to prepare a resist film with a thickness of 50 nm. The thickness of the formed film was measured using a film thickness measuring device (J.A. Woollam's "M-2000D").

[0225] The resist film was exposed to light using an electron beam lithography system F7000S-VD2 (manufactured by Advantest Corporation) at an acceleration voltage of 50 kV, with a target size of 1:1 line and space pattern (hereinafter also referred to as "LS pattern") with a line width of 50 nm. This was followed by a post-exposure bake (PEB) treatment at 90°C for 60 seconds. Development was then carried out for 60 seconds at 23°C using a developer (NMD-W (manufactured by Tokyo Ohka Kogyo Co., Ltd.)), followed by rinsing with pure water for 60 seconds. As a result, a 1:1 LS pattern with a line width of 50 nm was formed, yielding LS patterns 1 to 13 corresponding to the test resist materials R-1 to R-13. All of LS patterns 1 to 13 were positive-tone patterns.

[0226] [4. Evaluation of the Shape of LS Patterns] The shapes of the above LS patterns 1 to 13 (hereinafter also referred to as LS1 to 13, etc.) were observed using a length-measuring SEM (scanning electron microscope, accelerating voltage 10 kV, product name: SU-5000, manufactured by Hitachi High-Technologies Corporation), and the shapes were evaluated according to the following criteria. The results are shown in Table 2. A: Almost no trailing is observed in the LS pattern in the SEM image, and the resolution is excellent. B: Slight trailing is observed in part of the LS pattern in the SEM image. C: No LS pattern is formed (not resolved) in the entire SEM image.

[0227]

[0228] The results in Table 2 show that resist materials R-1 and R-2 containing polyacid salts A-1 and A-2, each of which has a polar group containing an acid-dissociable group in its cation moiety, and acid diffusion controller B-1 and B-2, can produce LS patterns with a line width of 50 nm and little tailing, with good resolution (LS1 and LS2). In contrast, resist materials R-3 to R-6, each of which contains polyacid salts A-3 to A-5, each of which does not have a polar group containing an acid-dissociable group in its cation moiety, produced LS patterns with a line width of 50 nm with good resolution, rated C (LS3 to LS6).

[0229] Furthermore, the results in Table 2 above show that by using resist materials R-7 to R-13 containing polyacid salts A-1 and A-6 to A-10 having a polar group containing an acid-dissociable group in the cation moiety and acid diffusion controllers B-1, B-2, or B-3, it is possible to obtain LS patterns (LS7 to LS10, LS12, and LS13) with little trailing and excellent resolution, or an LS pattern (LS11) with slight trailing.

Claims

1. A resist material comprising (A) a polyacid salt or a mixture thereof represented by general formula (I) and (B) an acid diffusion controller. ｍ＋ ) ａ (B ｎ＋ ) ｂ (C （ａｍ＋ｂｎ）－ ) (I) [wherein A ｍ＋ are each independently H ＋ , a metal ion, or an ammonium ion; B ｎ＋ each independently represents an onium cation or a dication having one or more polar groups having an acid dissociable group; （ａｍ＋ｂｎ）－ represents an isopolyacid anion or a heteropolyacid anion; m is an integer of 1 to 5, n is an integer of 1 or 2, a is a real number, and b is a real number greater than 0.

2. The resist material according to claim 1, wherein the onium cation or dication having one or more polar groups having an acid dissociable group is an organic sulfonium cation, an organic sulfonium dication, or an organic iodonium cation having one or more polar groups having an acid dissociable group.

3. The resist material according to claim 1, wherein the acid dissociable group is a tertiary carbon type acid dissociable group, an allyl type or benzyl type acid dissociable group, or an acetal type acid dissociable group.

4. The resist material according to claim 1, wherein the isopolyacid anion is an isopolyoxomolybdate anion, an isopolyoxotungstate anion, an isopolyoxoniobate anion, or an isopolyoxotantalate anion.

5. The resist material according to claim 1, wherein the polyatom of the heteropolyacid anion is Mo, W, V, Nb or Ta, and the heteroatom is P, Si, B, S or Ge.

6. The resist material according to claim 1, wherein the (B) acid diffusion control agent is (B1) a photodegradable base.

7. The resist material according to claim 1, further comprising an organic solvent.

8. The resist material according to any one of claims 1 to 7, which is a resist material for electron beam or EUV.

9. A pattern formation method comprising the steps of: forming a resist film using the resist material according to any one of claims 1 to 7; exposing the resist film to light; and developing the exposed resist film using a developer.

10. The step of exposing the resist film is performed by exposing the resist film to light at a temperature of 2 mC / cm ２ Electron beam or 200 mJ / cm ２ The pattern forming method according to claim 9 , further comprising the step of exposing to extreme ultraviolet light as follows:

11. A patterned structure obtained by patterning the resist material according to any one of claims 1 to 7.

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