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Cleaning method of immersion liquid, immersion liquid cleaning composition, and substrate

Inactive Publication Date: 2013-08-22
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a composition that can be used to form an organic film. The composition contains a polymer (A), a compound (B), and a solvent (C). The polymer (A) is the main component of the organic film and should have a specific structural unit (I). The composition may also contain other components that do not detract from its benefits. The polymer (A) should have the structural unit (I) to efficiently clean the immersion liquid. The polymer (A) can have different types of the structural unit (I), and examples include linear and branched alkyl groups, monocyclic and polycyclic saturated and unsaturated hydrocarbon groups, and mono and polycyclic aromatic groups. The compound (B) is a polymer that can enhance the properties of the organic film. The composition may also contain other components such as hydroxyl, carboxyl, alkoxyl, and cyano groups. The technical effect of the invention is to provide a composition that can efficiently form an organic film with improved properties.

Problems solved by technology

However, also when the liquid immersion upper layer film is provided, the immersion liquid may be contaminated with slight amounts of resist film components and liquid immersion upper layer film components, or with dust present in the liquid immersion lithography apparatus during a formation step of a resist pattern carried out using a liquid immersion lithography process.

Method used

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  • Cleaning method of immersion liquid, immersion liquid cleaning composition, and substrate
  • Cleaning method of immersion liquid, immersion liquid cleaning composition, and substrate
  • Cleaning method of immersion liquid, immersion liquid cleaning composition, and substrate

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of (A-1)

[0184]Into a flask were charged 50.4 g (50% by mole) of (M-1), 37.2 g (35% by mole) of (M-2) and 12.4 g (15% by mole) of (M-3) as monomers, 4.03 g of 2,2′-azobisisobutyronitrile as a polymerization initiator, and 200 g of 2-butanone as a polymerization solvent, and a polymerization reaction was allowed by stirring under nitrogen at 80° C. for 6 hours. After completing the polymerization reaction, the polymerize solution was cooled with water to 30° C. or below, and then the mixture was charged into 200 g of methanol. The powder thus deposited was filtered off. The powder obtained by filtration was washed twice with 400 g of methanol, and again filtered off, followed by drying at 50° C. for 17 hours to obtain a polymer (A-1) (yield: 75 g; yield percentage: 75%). This polymer had a Mw of 6,900, and the Mw / Mn was 1.4. As a result of a 13C-NMR analysis, the contents of structural units derived from (M-1), (M-2) and (M-3) were 50.9% by mole, 34.6% by mole and 14.5% by m...

synthesis example 2

Synthesis of (A-2)

[0185]A polymer (A-2) was obtained (yield: 80 g; yield percentage: 80%) by a similar operation to Synthesis Example 1 except that 40.17 g (40% by mole) of (M-1), 37.06 g (45% by mole) of (M-4) and 22.77 g (15% by mole) of (M-5) were charged as monomers. This polymer had a Mw of 6,100, and the Mw / Mn was 1.4. As a result of the 13C-NMR analysis, the contents of structural units derived from (M-1), (M-4) and (M-5) were 40.0% by mole, 45.0% by mole and 15.0% by mole, respectively.

synthesis example 3

Synthesis of (A-3)

[0186]A polymer (A-3) was obtained (yield: 78 g; yield percentage: 78%) by a similar operation to Synthesis Example 1 except that 41.49 g (40% by mole) of (M-1), 21.87 g (20% by mole) of (M-2), 23.55 g (30% by mole) of (M-4) and 13.08 g (10% by mole) of (M-6) were charged as monomers. This polymer had a Mw of 9,000, and the Mw / Mn was 1.3. As a result of the 13C-NMR analysis, the contents of structural units derived from (M-1), (M-2), (M-4) and (M-6) were 42.0% by mole, 20.5% by mole, 28.0% by mole and 9.5% by mole, respectively.

Synthesis of Polymer (D)

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PUM

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Abstract

A cleaning method of an immersion liquid includes supplying an immersion liquid on a surface of a cleaning substrate. The immersion liquid is to be used in a liquid immersion lithography apparatus. The cleaning substrate has a substrate and an organic film laminated on a top face side of the substrate. The immersion liquid is allowed to move on the substrate to remove contaminants from the immersion liquid.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a cleaning method of an immersion liquid, an immersion liquid cleaning composition, and a substrate.[0003]2. Discussion of the Background[0004]In manufacture of semiconductor devices, microfabrication by lithography carried out using a chemically amplified resist composition has been conventionally carried out. A pattern formation method used in the microfabrication generally includes: a step of forming a resist film on a substrate; a step of exposure by irradiating the resist film with an actinic ray such as ultraviolet ray through a mask; a step of development of the exposed resist film; and a step of etching using the obtained resist pattern as a protective film.[0005]In recent years, enhanced integration of semiconductor devices has progressed, and thus further miniaturization of resist patterns in lithography has been demanded. Accordingly, as a method for forming a resist pattern t...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01D15/00
CPCB01D15/00G03F7/70925G03F7/70341B01J20/26G03F7/70975
Inventor HARADA, KENTAROWAKAMATSU, GOJI
Owner JSR CORPORATIOON