A conjugated polymer containing selenium phen and alkoxy chain substituted bithiophene and its preparation method and application

Abstract

The present application relates to a kind of conjugated polymer containing selenophene and alkoxyl chain substituted dithiophene and its preparation method and application.The side chain of dithiophene in the conjugated polymer containing selenophene and alkoxyl chain substituted dithiophene is alkoxyl chain;The structural general formula of the conjugated polymer containing selenophene and alkoxyl chain substituted dithiophene is as follows: wherein, the n is 10~50 natural number, preferably 10~30, more preferably 10, 15 or 30;The k is 1~5 natural number;The m is 1~10 natural number, represents the number of alkoxyl chain unit.

Description

Technical Field

[0001] This invention relates to a method for synthesizing and preparing thin films of a high-conductivity polymer thermoelectric material and its application, belonging to the field of conductive polymer materials technology. Background Technology

[0002] Conductive polymers are a class of polymeric materials that transform insulators into conductors through chemical or electrochemical doping of polymers with conjugated π bonds. Due to their unique chemical structure and excellent electrical properties, conductive polymers have broad application prospects in energy, optoelectronic devices, and sensing fields. In recent years, the application of conductive polymers in thermoelectric conversion devices has attracted widespread interest, and the development of high-performance polymer thermoelectric conversion materials has remained a key focus of research in this field.

[0003] In 1977, American scientists Alan J. Heeger and Alan G. MacDiarmid, along with Japanese scientist Hideki Shirakawa, discovered that doped polyacetylene possesses metallic conductivity, thus initiating research in the field of conductive polymers. Traditional conductive polymers include polyacetylene, polypyrrole, polythiophene, and polyaniline. Among these, polythiophene and its derivatives have become a research hotspot in polymer thermoelectric materials due to their aromatic ring-like structure, good environmental stability, ease of preparation, and high conductivity after doping. However, unsubstituted polythiophene has poor solubility and is difficult to process, thus limiting its widespread commercial application. Side-chain substituted polythiophene solves the solubility and stability problems, but the steric hindrance of the side chains causes thiophene torsion, reducing both conjugation and conductivity. Therefore, developing highly conductive, solution-processable, and highly stable polythiophene thermoelectric materials remains an important research direction in the field of organic thermoelectrics.

[0004] Currently, alkyl side chains (such as P3HT) and heteroatom side chains (such as poly(3-methoxythiophene)) are mainly used for high-conductivity polythiophene and its derivatives. Although these side chain substitutions can make polythiophene have high solubility, the disorder of side chains and random insertion of dopants make it more difficult to control the polymer morphology, and the conductivity of the polymer will decrease significantly. Therefore, how to obtain high conductivity while maintaining high solubility is a research challenge for thiophene-type polymer thermoelectric materials. Summary of the Invention

[0005] Therefore, the present invention provides a conjugated polymer containing selenophene and alkoxy-substituted bithiophene, its preparation method and application.

[0006] In a first aspect, the present invention provides a conjugated polymer containing selenophene and alkoxy-substituted bithiophene, wherein the side chain of bithiophene in the conjugated polymer containing selenophene and alkoxy-substituted bithiophene is an alkoxy chain; the general structural formula of the conjugated polymer containing selenophene and alkoxy-substituted bithiophene is:

[0007]

[0008] Wherein, n is a natural number from 10 to 50, preferably from 10 to 30, and more preferably 10, 15 or 30;

[0009] k is a natural number from 1 to 5;

[0010] The m is a natural number from 1 to 10, representing the number of alkoxy chain units.

[0011] Traditional polymers use thiophene units as the conjugated backbone and long alkyl groups as side chains. This invention, aiming to design and synthesize novel polythiophene derivatives with high conductivity, high stability, high solubility, and solution processability, employs a conjugated polymer containing selenophene and bithiophene, where the bithiophene side chain is an alkoxy chain. Currently, polythiophene and its derivatives mainly utilize alkyl side chains (e.g., P3HT) and heteroatom side chains (e.g., poly(3-methoxythiophene)) to improve solubility. Alkyl side chain substitution can enhance the solubility of polythiophene, but the disorder of the side chains and the random insertion of dopants increase the difficulty of polymer morphology control, and significantly reduce the polymer's conductivity. Alkoxy chain substitution can significantly improve the HOMO energy level of the polymer, increasing both solubility and doping efficiency. Furthermore, adding selenophene with a higher degree of conjugation to the backbone is beneficial for further improving conductivity.

[0012] Secondly, the present invention provides a method for preparing a conjugated polymer containing selenophene and alkoxy-substituted bithiophene, comprising:

[0013] (1) Place compound 1 and compound 2 into a reaction flask, add chlorobenzene, evacuate to a vacuum, and then purge with inert gas.

[0014] (2) Palladium catalyst and phosphine ligand were added, and after being evacuated to a vacuum again, inert gas was introduced and reacted at 100-120°C for 3-48 hours. Finally, after purification, the conjugated polymer containing selenophene and alkoxy-substituted bithiophene was obtained.

[0015] The chemical formula of compound 1 is as follows:

[0016]

[0017] The chemical formula of compound 2 is as follows:

[0018]

[0019] Where k is a natural number from 1 to 5, X is selected from at least one of I, Br and Cl; Y is selected from at least one of trialkyltin group, borate group, borate ester group and zinc halide;

[0020] Preferably, the molar ratio of compound 1 to compound 2 is 1:1;

[0021] Preferably, the trialkyltin group is selected from at least one of trimethyltin, triethyltin, and tributyltin; the zinc halide is selected from zinc chloride and / or zinc bromide; and the borate group is selected from at least one of 1,3,2-dioxaborane-2-yl, 4,4,5,5-tetramethyl-1,2,3-dioxacyclopentaborane-2-yl, and 5,5-dimethyl-1,3,2-dioxaborane-2-yl.

[0022] Preferably, the mass ratio of chlorobenzene to compound 1 is 1:(10-20).

[0023] Preferably, the palladium catalyst is selected from at least one of tris(dibenzylacetone)dipalladium, tetra(triphenylphosphine)palladium, and tris(dibenzylacetone)dipalladium chloroform adduct; the mass ratio of the palladium catalyst to compound 1 is 1:(50-60);

[0024] The phosphorus ligand is selected from at least one of tris(o-methylphenyl)phosphine, 2-(di-tert-butylphosphine)biphenyl and tris(2-furanyl)phosphine; the mass ratio of the phosphorus ligand to compound 1 is 1:(25-35).

[0025] Thirdly, the present invention provides a composition selected from the above-mentioned conjugated polymers containing selenophene and alkoxy-substituted bithiophene and small molecule dopants; the small molecule dopants are small molecules capable of charge transfer and / or energy transfer with the polymers, preferably at least one of ferric chloride, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, ferric trifluoromethylbenzenesulfonate, ferric methylbenzenesulfonate, nitrosine tetrafluoroborate, nitrosine hexafluorophosphate, and substituted fullerene compounds.

[0026] Fourthly, the present invention provides a method for preparing a composition, wherein a conjugated polymer containing selenophene and alkoxy-substituted bithiophene and a small molecule dopant are dissolved in an organic solvent to obtain the composition; preferably, the organic solvent is toluene, chlorobenzene, dichlorobenzene, trichlorobenzene or tetrahydrofuran.

[0027] Fifthly, the present invention provides a method for preparing a composition, comprising:

[0028] (1) A conjugated polymer containing selenophene and alkoxy-substituted bithiophene is prepared into a polymer film by drop coating, spin coating or dip coating.

[0029] (2) The obtained polymer film is immersed in a small molecule dopant solution, and then cleaned and dried to obtain the composition; or, the small molecule dopant solution is spin-coated onto the surface of the obtained polymer film, and then cleaned and dried to obtain the composition.

[0030] Preferably, the concentration of the small molecule dopant solution is 0.1–5 mg / L; the solvent of the small molecule dopant solution is at least one selected from acetonitrile, methanol, ethanol, and dimethylacetamide.

[0031] Sixthly, the present invention provides the application of a conjugated polymer containing selenophene and alkoxy-substituted bithiophene in the fabrication of organic thermoelectric conversion devices and organic field-effect transistors. For example, thermoelectric conversion devices or organic field-effect transistors containing the polymer shown in Formula I provided by the present invention, thermoelectric conversion devices or organic field-effect transistors using the polymer shown in Formula I provided by the present invention as a charge transport layer, and the use of the polymer provided by the present invention in the fabrication of thermoelectric devices or organic field-effect transistors are also within the scope of protection of the present invention.

[0032] In a seventh aspect, the present invention provides the use of a composition in the preparation of organic thermoelectric conversion devices and organic field-effect transistors.

[0033] The beneficial effects of this invention are:

[0034] This invention is the first to design and synthesize a conjugated polymer containing selenophene and bithiophene, applying it to organic thermoelectric materials, organic field-effect transistors, and other fields. The polymer molecules provided by this invention are solution-processable, exhibit good film-forming properties, and possess high conductivity and stability. They can serve as charge transport layer materials in organic thermoelectric conversion materials and organic field-effect transistors, representing a promising polymer material with broad application prospects. Starting from material structure design, this invention effectively controls solubility, stability, and electrical properties by utilizing the structural characteristics of the polymer units, and fundamentally explores the relationship between polymer semiconductor structure and conductivity, which is of great significance for the preparation of high-performance conductive polymers. Attached Figure Description

[0035] Figure 1 The differential scanning calorimetry (DSC) curve of the polymer shown in Example 1 is obtained from... Figure 1 It can be seen that the polymer does not crystallize or undergo phase transition from room temperature to 275°C;

[0036] Figure 2 The conductivity and Seebeck coefficient of the composition obtained in Example 2: 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone-doped conjugated polymer near room temperature, from... Figure 2As can be seen from this, the polymer has a high electrical conductivity (approximately 500 S cm⁻¹). -1 ) and a moderate Seebeck coefficient (approximately 15 μV K) -1 );

[0037] Figure 3 The transfer and output curves of the field-effect transistor prepared using the polymer obtained in Example 1 are shown. The intrinsic mobility of the polymer is 7.8 × 10⁻⁶. -4 cm 2 V -1 s -1 . Detailed Implementation

[0038] The present invention will be further illustrated by the following embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the present invention.

[0039] In this disclosure, the structural formula of the conjugated polymer containing selenophene and bithiophene is as follows:

[0040]

[0041] Wherein, n is a natural number between 10 and 50, preferably between 10 and 30, specifically 10, 15, or 30;

[0042] The above k is a natural number from 1 to 5, representing the number of selenophene units in a repeating unit; the above m is a natural number from 1 to 10, representing the number of alkoxy chain units.

[0043] In one embodiment of the present invention, compounds 1 and 2 are selected as raw materials, and a copolymerization reaction is carried out under an inert atmosphere and in the presence of a palladium catalyst to obtain the polymer shown in Formula I. The polymerization method uses Stille coupling or Suzuki coupling; the chemical formulas of the raw materials used are as follows:

[0044]

[0045] Wherein, X is selected from at least one of I, Br, and Cl; Y is selected from at least one of trialkyltin group, borate group, borate ester group, and zinc halide; preferably, the trialkyltin group is selected from at least one of trimethyltin, triethyltin, and tributyltin, the zinc halide is selected from zinc chloride and / or zinc bromide, and the borate group is selected from at least one of 1,3,2-dioxaborane-2-yl, 4,4,5,5-tetramethyl-1,2,3-dioxacyclopentaborane-2-yl, and 5,5-dimethyl-1,3,2-dioxaborane-2-yl.

[0046] In this invention, the conjugated polymer, after full-solution blending and doping, can achieve a conductivity higher than 500 S cm⁻¹. -1The conductivity of this conductive polymer is superior to that of traditional thiophene-type conjugated polymers. Furthermore, the conductive polymer exhibits good solution processing properties and excellent air stability, making it suitable for applications such as thermoelectric conversion devices and field-effect transistors. The following exemplarily illustrates a method for preparing a conjugated polymer containing selenophene and alkoxy-substituted bithiophene.

[0047] Compound 1 and Compound 2 are selected as raw materials. They are placed in a reaction flask at a molar ratio of 1:1, followed by the addition of chlorobenzene. The mixture is then evacuated and purged with an inert gas. This step is merely a physical mixing process. The mass ratio of chlorobenzene to Compound 1 can be 1:(10-20).

[0048] Palladium catalyst and phosphorus ligand are added, the mixture is evacuated again, then purged with inert gas, and reacted at 100–120°C for 3–48 hours. Compound 1 and Compound 2 undergo Stille coupling reaction. After purification to remove oligomers and catalyst impurities, the conjugated polymer containing selenophene and alkoxy-substituted bithiophene is obtained. The palladium catalyst is selected from tris(dibenzylacetone)dipalladium, tetra(triphenylphosphine)palladium, tris(dibenzylacetone)dipalladium chloroform adduct, etc. The mass ratio of palladium catalyst to Compound 1 is preferably 1:(50–60). The phosphorus ligand is selected from tris(o-methylphenyl)phosphine, 2-(di-tert-butylphosphine)biphenyl, and tris(2-furanyl)phosphine, etc. The mass ratio of phosphorus ligand to Compound 1 is preferably 1:(25–35).

[0049] After the reaction was complete, the resulting polymer solution was cooled and precipitated in methanol. The precipitate was then washed for 24 hours each with methanol, acetone, petroleum ether, and chloroform in a Soxhlet extractor. The chloroform eluent was concentrated and then precipitated again with methanol to obtain the polymer solid.

[0050] In this disclosure, a conjugated polymer containing selenophene and alkoxy-substituted bithiophene is combined with a small molecule dopant to form a composition. The mixing methods include, but are not limited to, full solution mixing, dipping, or continuous spin coating. The small molecule dopant can undergo charge transfer and / or energy transfer with either of the two polymers mentioned above. The small molecule dopant is selected from ferric chloride, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, ferric trifluoromethylbenzenesulfonate, ferric methylbenzenesulfonate, nitrosine tetrafluoroborate, nitrosine hexafluorophosphate, and C. 60 C 70 C 80 Or some substituted fullerene compounds (such as [6,6]-phenylC) 61 Methyl butyrate and indene-containing fullerenes, etc. More preferably, ferric chloride, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, nitrosyl tetrafluoroborate, [6,6]-phenyl C 61 Methyl butyrate, etc.

[0051] In one embodiment of the present invention, the composition may exist in solution form. A conjugated polymer containing selenophene and alkoxy-substituted bithiophene and a small molecule dopant are dissolved separately in an organic solvent and mixed in any proportion, preferably with a polymer to small molecule mass ratio of 1:0.1 to 1:0.5, to obtain the composition. The organic solvent may be toluene, chlorobenzene, dichlorobenzene, trichlorobenzene, or tetrahydrofuran, etc.

[0052] In another embodiment of the invention, the composition can exist in the form of a thin film. A polymer film is obtained by drop-coating, spin-coating, or stretching a conjugated polymer containing selenophene and alkoxy-substituted bithiophene. The polymer film is then placed in a small molecule dopant solution for a certain period of time, followed by washing and drying to obtain the above composition. Alternatively, a small molecule dopant solution can be spin-coated onto the polymer film, followed by washing and drying to obtain the above composition. The concentration of the small molecule dopant solution can be 0.1-5 mg / mL. The solvent used is preferably acetonitrile, methanol, ethanol, or dimethylacetamide.

[0053] In this invention, conjugated polymers containing selenophene and alkoxy-substituted bithiophene can be applied in organic thermoelectric conversion devices or organic field-effect transistors. For example, conjugated polymers containing selenophene and alkoxy-substituted bithiophene can be used as charge transport layers in organic thermoelectric conversion devices or organic field-effect transistors.

[0054] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0055] Example 1

[0056] Prepare the conjugated copolymer shown in Formula I-1;

[0057]

[0058] The specific steps and conditions for the above polymerization reaction are as follows:

[0059] (1) 5,5'-dibromo-3,3'-bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-2,2'-bithiophene (150.0 mg) was added to a polymerization flask, followed by 2,5-bistrimethyltinylselenophene (106.0 mg), 5 mL of chlorobenzene, vacuum deoxygenation, argon gas purging, palladium catalyst (2.1 mg) and phosphorus ligand (5.7 mg) were added, vacuum purging and argon gas purging were performed again, and the solution was heated to 110 °C and stirred for 3 hours. After the reaction was completed, the reaction was purified: the reaction solution was added dropwise to methanol, and a blue-black flocculent precipitate was formed. The solid was filtered, wrapped in filter paper, and placed in a Soxhlet extractor. It was extracted successively with methanol, acetone, petroleum ether, and chloroform for 24 hours. The chloroform extract was collected, precipitated again in methanol, filtered, and vacuum dried. The black flocculent precipitate was the product, corresponding to m=3, k=1, n=50. GPC:M n =35910 g / mol; PDI = 1.8.

[0060] The polymer obtained in Example 1 was subjected to differential scanning calorimetry (DSC) experiments. Specifically, 10 mg of polymer powder was placed in a high-purity alumina crucible, and the sample changes were measured using a differential scanning calorimeter in a nitrogen atmosphere from 0 to 275 °C. The heating rate was 10 °C / min. Figure 1 ).

[0061] Example 2

[0062] The polymer material provided by this invention and 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone were mixed using a liquid-phase chemical doping method. The polymer obtained in Example 1 was dissolved in chloroform to prepare a 5 mg / mL solution, and 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone was dissolved in acetonitrile solution to prepare a 1 mg / mL solution. The polymer solution and the dopant solution described in Formula I-1 were mixed at a mass ratio of 3:1 to obtain the doped solution composition.

[0063] Example 3

[0064] The polymer material provided by this invention was doped with ferric chloride using an impregnation method. The polymer obtained in Example 1 was dissolved in chloroform or chlorobenzene solution to prepare a 5 mg / mL solution, which was then drop-coated onto a glass substrate. After the solvent evaporated, the substrate was annealed at 120°C for 30 minutes. Ferric chloride was dissolved in acetonitrile to prepare a 5 mg / mL solution. The polymer film was immersed in the ferric chloride solution for 1 minute, then removed and rinsed with acetonitrile to obtain the film composition.

[0065] Example 4

[0066] A thermoelectric conversion device containing the polymer provided in this invention was prepared. A glass substrate was ultrasonicated in deionized water, acetone, and isopropanol for 15 minutes each, dried, and then subjected to 10... -4 A 50 nm thick gold electrode was deposited under a pressure of Pa. One of the polymers prepared in Example 1 was dissolved in chlorobenzene (5 mg / mL) and drop-coated onto a glass substrate with the gold electrode. After the solvent evaporated, the substrate was annealed for 30 minutes at 120 °C in a glove box. A 5 mg / mL solution of ferric chloride was prepared by dissolving ferric chloride in acetonitrile. A polymer film (2-3 μm thick) was immersed in the ferric chloride solution for 1 minute, removed, rinsed with acetonitrile, and dried to obtain the thermoelectric conversion device. The conductivity and Seebeck coefficient of the film were tested using the four-probe method.

[0067] Example 5

[0068] Based on the solution composition of Example 2, a thermoelectric conversion device was prepared according to Example 4, and the conductivity was measured to be 558.9 Scm. -1 The Zebeck coefficient is 13.9 μV K. -1 A power factor of 10.8 μW K was obtained. -2 m -1 (like Figure 2 (as shown);

[0069] Organic field-effect transistors were fabricated based on the polymer obtained in Example 1, and the mobility of the resulting solution composition was found to be 7.8 × 10⁻⁶. -4 cm 2 V -1 s -1 ( Figure 3 The fabrication process of this organic field-effect transistor includes: ultrasonicating a silicon substrate containing a silicon dioxide layer in deionized water, acetone, and isopropanol for 15 minutes each; placing the substrate in a vacuum oven and modifying its surface with a hexamethyldisilamine (HMDS) monolayer; spin-coating a solution composition (5 mg / mL) onto the substrate; annealing the substrate on a 120°C hot plate in a glove box for 30 minutes; and then... -4 A gold electrode with a thickness of 50 nm was deposited under a pressure of Pa.

[0070] The above description of the embodiments is intended to facilitate understanding and use of the present invention by those skilled in the art. However, the present invention is not limited to the described implementation schemes and embodiments. Modifications and substitutions made by those skilled in the art based on the teachings of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A conjugated polymer containing selenophene and alkoxy-substituted bithiophene, characterized in that, In the conjugated polymer containing selenophene and alkoxy-substituted bithiophene, the side chain of bithiophene is an alkoxy chain; the general structural formula of the conjugated polymer containing selenophene and alkoxy-substituted bithiophene is: ； Wherein, n is a natural number from 10 to 50; k is a natural number from 1 to 5; The m is a natural number from 1 to 10, representing the number of alkoxy chain units.

2. The conjugated polymer according to claim 1, characterized in that, The value of n is between 10 and 30.

3. The conjugated polymer according to claim 2, characterized in that, The n is 10, 15, or 30.

4. A method for preparing a conjugated polymer containing selenophene and alkoxy-substituted bithiophene according to any one of claims 1 to 3, characterized in that, include: (1) Place compound 1 and compound 2 into a reaction flask, add chlorobenzene, evacuate to a vacuum, and then purge with inert gas; (2) Palladium catalyst and phosphorus ligand were added, and after being evacuated to a vacuum again, inert gas was introduced and reacted at 100-120°C for 3-48 hours. Finally, after purification, the conjugated polymer containing selenophene and alkoxy-substituted bithiophene was obtained. The chemical formula of compound 1 is as follows: ； The chemical formula of compound 2 is as follows: ； Wherein, k is a natural number from 1 to 5, X is selected from at least one of I, Br and Cl; Y is selected from at least one of trialkyltin group, borate group, borate ester group and zinc halide.

5. The preparation method according to claim 4, characterized in that, The molar ratio of compound 1 to compound 2 is 1:

1.

6. The preparation method according to claim 4, characterized in that, The trialkyltin group is selected from at least one of trimethyltin, triethyltin, and tributyltin; the zinc halide is selected from zinc chloride and / or zinc bromide; and the borate group is selected from at least one of 1,3,2-dioxaborane-2-yl, 4,4,5,5-tetramethyl-1,2,3-dioxacyclopentaborane-2-yl, and 5,5-dimethyl-1,3,2-dioxaborane-2-yl.

7. The preparation method according to claim 4, characterized in that, The mass ratio of chlorobenzene to compound 1 is 1:(10-20).

8. The preparation method according to any one of claims 4 to 7, characterized in that, The palladium catalyst is selected from at least one of tris(dibenzylacetone)palladium, tetra(triphenylphosphine)palladium, and tris(dibenzylacetone)palladium chloroform adduct; the mass ratio of the palladium catalyst to compound 1 is 1:(50-60). The phosphorus ligand is selected from at least one of tris(o-methylphenyl)phosphine, 2-(di-tert-butylphosphine)biphenyl and tris(2-furanyl)phosphine; the mass ratio of the phosphorus ligand to compound 1 is 1:(25-35).

9. A composition, characterized in that, The product comprises a conjugated polymer containing selenophene and alkoxy-substituted bithiophene selected from any one of claims 1 to 3, and a small molecule dopant; the small molecule dopant is a small molecule capable of charge transfer and / or energy transfer with the conjugated polymer.

10. The composition according to claim 9, characterized in that, The small molecule dopant is at least one of ferric chloride, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, ferric trifluoromethylbenzenesulfonate, ferric methylbenzenesulfonate, nitrosine tetrafluoroborate, nitrosine hexafluorophosphate, and substituted fullerene compounds.

11. A method for preparing the composition according to claim 9 or 10, characterized in that, The composition is obtained by dissolving a conjugated polymer containing selenophene and alkoxy-substituted bithiophene and a small molecule dopant in an organic solvent; the organic solvent is toluene, chlorobenzene, dichlorobenzene, trichlorobenzene or tetrahydrofuran.

12. A method for preparing the composition according to claim 9 or 10, characterized in that, include: (1) A polymer film is prepared by drop coating, spin coating or dip coating of a conjugated polymer containing selenophene and alkoxy-substituted bithiophene; (2) The obtained polymer film is immersed in a small molecule dopant solution, and then washed and dried to obtain the composition; Alternatively, a small molecule dopant solution can be spin-coated onto the surface of the obtained polymer film, followed by cleaning and drying to obtain the composition.

13. The preparation method according to claim 12, characterized in that, The concentration of the small molecule dopant solution is 0.1–5 mg / L; the solvent of the small molecule dopant solution is at least one of acetonitrile, methanol, ethanol and dimethylacetamide.

14. The use of a conjugated polymer containing selenophene and alkoxy-substituted bithiophene as described in any one of claims 1 to 3 in the preparation of organic thermoelectric conversion devices and organic field-effect transistors.

15. The use of the composition of claim 9 or 10 in the preparation of organic thermoelectric conversion devices and organic field-effect transistors.

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