Source: http://www.google.com/patents/US8043795?dq=5,758,352
Timestamp: 2016-07-30 19:38:48
Document Index: 504642266

Matched Legal Cases: ['Application No. 2006', 'art 2', 'art 1', 'Application No. 2004', 'Application No. 2004', 'Application No. 05806132']

Patent US8043795 - Method of forming resist pattern - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsDisclosed is a method of forming a resist pattern, including: applying a positive resist composition on a support 1 to form a first resist film 2; selectively exposing the first resist film 2 through a first mask pattern, and developing it to form a first resist pattern 3; applying a negative resist...http://www.google.com/patents/US8043795?utm_source=gb-gplus-sharePatent US8043795 - Method of forming resist patternAdvanced Patent SearchPublication numberUS8043795 B2Publication typeGrantApplication numberUS 12/441,704PCT numberPCT/JP2007/068089Publication dateOct 25, 2011Filing dateSep 18, 2007Priority dateSep 19, 2006Fee statusPaidAlso published asUS20100062379, WO2008035676A1Publication number12441704, 441704, PCT/2007/68089, PCT/JP/2007/068089, PCT/JP/2007/68089, PCT/JP/7/068089, PCT/JP/7/68089, PCT/JP2007/068089, PCT/JP2007/68089, PCT/JP2007068089, PCT/JP200768089, PCT/JP7/068089, PCT/JP7/68089, PCT/JP7068089, PCT/JP768089, US 8043795 B2, US 8043795B2, US-B2-8043795, US8043795 B2, US8043795B2InventorsJun IwashitaOriginal AssigneeTokyo Ohika Kogyo Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (35), Non-Patent Citations (10), Referenced by (3), Classifications (18), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethod of forming resist pattern
US 8043795 B2Abstract
Disclosed is a method of forming a resist pattern, including: applying a positive resist composition on a support 1 to form a first resist film 2; selectively exposing the first resist film 2 through a first mask pattern, and developing it to form a first resist pattern 3; applying a negative resist composition including an organic solvent (S″) containing an alcohol-based organic solvent on the support 1 that the first resist pattern 3 is formed, thereby forming a second resist film 6; and selectively exposing the second resist film 6 through a second mask pattern, and developing it to form a resist pattern denser than the first resist pattern 3. Images(2) Claims(9)
(In the formula, X″ represents a fluorinated hydroxyalkyl group; and r represents an integer of 0 or 1). Description
This application is the U.S. National Phase filing under 35 U.S.C. �371 of PCT/JP2007/068089, filed Sep. 18, 2007, which designated the United States and was published in a language other than English, which claims priority under 35 U.S.C. �119(a)-(d) to Japanese Patent Application No. 2006-253186, filed Sep. 19, 2006. The contents of these applications are incorporated herein by reference in their entireties.
Component (A-1): a resin having a hydrophilic group and an acid dissociable, dissolution inhibiting group. Component (A-2): a low molecular weight compound having a hydrophilic group and an acid dissociable, dissolution inhibiting group. Hereinafter, a preferable mode of the components (A-1) and (A-2) will be explained more specifically.
The component (S1) preferably has a boiling point within the range of 80 to 160� C., more preferably 90 to 150� C., and most preferably 100 to 135� C., from the viewpoints of the resulting coating properties, the stability of the composition upon storage, and the heating temperature required in the PAB step and/or PEB step.
Specific examples of the alcohol-based solvent include n-amyl alcohol (boiling point: 138.0� C.) s-amyl alcohol (boiling point: 119.3� C.), t-amyl alcohol (boiling point: 101.8� C.), isoamyl alcohol (boiling point: 130.8� C.), isobutanol (also called isobutyl alcohol or 2-methyl-1-propanol) (boiling point: 107.9� C.), isopropyl alcohol (boiling point: 82.3� C.), 2-ethylbutanol (boiling point: 147� C.), neopentyl alcohol (boiling point: 114� C.), n-butanol (boiling point: 117.7� C.), s-butanol (boiling point: 99.5� C.), t-butanol (boiling point: 82.5� C.), 1-propanol (boiling point: 97.2� C.), n-hexanol (boiling point: 157.1� C.), 2-heptanol (boiling point: 160.4� C.), 3-heptanol (boiling point: 156.2� C.), 2-methyl-1-butanol (boiling point: 128.0� C.), 2-methyl-2-butanol (boiling point: 112.0� C.), and 4-methyl-2-pentanol (boiling point: 131.8� C.). Of these, isobutanol (2-methyl-1-propanol), 4-methyl-2-pentanol, or n-butanol is preferred, because the effects due to the inclusion of the above component (5″) are satisfactorily obtained, and the effects of the present invention can be improved. Of these, isobutanol or n-butanol is particularly desirable, and isobutanol is most preferable.
If an organic film is provided, the organic film can be formed, for example, by applying an organic film-forming material in which a resin component or the like constituting the organic film is dissolved in an organic solvent to a substrate using a spinner or the like, and then conducting a bake treatment under heating conditions of preferably 200 to 300� C. for 30 to 300 seconds, and more preferably 60 to 180 seconds.
For example, the positive resist composition described above is first applied onto a support using a spinner or the like, a prebake is then conducted under temperature conditions of 80 to 150� C. for 40 to 120 seconds, preferably for 60 to 90 seconds, to volatilize the organic solvent, thereby enabling the first resist film to be formed.
The patterning step (1) can be conducted by using conventional methods. Examples thereof include the following. The first resist film 2 is selectively exposed through a prescribed mask pattern, a bake treatment (post exposure baking (PEB)) is then conducted under temperature conditions of 80 to 150� C. for 40 to 120 seconds, preferably for 60 to 90 seconds, and an alkali-developing treatment is conducted using a 0.1 to 10% by weight aqueous solution of tetramethylammonium hydroxide (TMAH), thereby removing the exposed portions of the first resist film 2 formed from the positive resist composition. As a result, a first resist pattern 3 is formed.
Specific examples of the fluorine-based inactive liquid include a liquid which has a fluorine-based compound as a main component, such as C3HCl2F5, C4F9OCH3, C4F9OC2H5, and C5H3F7. The fluorine-based inactive liquid preferably has a boiling point within the range of 70 to 180� C., and more preferably 80 to 160� C. If the fluorine-based inactive liquid has a boiling point within the above range, the solvent used for the immersion lithography can be removed by a convenient method after exposure, and consequently it is preferable.
Specific examples of the perfluoroalkylether compounds include perfluoro(2-butyl-tetrahydrofuran) (boiling point: 102� C.), and specific examples of the perfluoroalkylamine compounds include perfluorotributylamine (boiling point: 174� C.).
That is, an organic anti-reflection film composition (product name: “ARC29”, manufactured by Brewer Science Ltd.) was applied onto an 8-inch silicon wafer using a spinner, and the composition was then baked at 205� C. for 60 seconds to be dried, thereby forming an organic anti-reflection film having a film thickness of 30 nm.
An ArF resist composition (product name: “TArF-P6239”, manufactured by Tokyo Ohka Kogyo Co., Ltd.) was applied onto the antireflection film using a spinner, followed by drying by conducting a prebake (PAB) treatment on a hotplate at 80� C. for 60 seconds, thereby forming a positive resist film having a film thickness of 160 nm.
Thereafter, a post exposure baking (PEB) treatment was conducted at 100� C. for 60 seconds, followed by a developing treatment for 60 seconds at 23� C. in a 2.38% by weight aqueous solution of tetramethylammonium hydroxide (TMAH).
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