Patent ID: 6403288
Filing Date: 2002-06-11
Classification: G03F,Y10S

Abstract:
A method of forming a resist pattern from a chemically amplified positive radiation sensitive resin composition, comprising:coating a solution of the resin composition onto a substrate, thereby forming a resist film, said resin composition comprising a resin consisting essentially of repeat units represented by formula 1 and at least one monomer selected from the group consisting of styrene, &agr;-methylstyrene and p-methylstyrene; exposing the resist film through a predetermined mask pattern, thereby forming an exposed portion and an unexposed portion of the resist film; and developing the exposed resist film with an aqueous-alkaline developer to form a predetermined resist pattern, wherein the thickness of the unexposed portion of the resist film after said developing is 100 to 400 Ã¥ less than the thickness of the unexposed portion of the resist film before said developing, the developed resist film has a resolution of no more than 0.22 &mgr;m, R1 is a hydrogen atom or methyl group, R2 is a halogen atom or monovalent organic group having 1 to 6 carbon atoms, n is an integer of 0 to 3, and at least one of the hydrogen atoms of the hydroxyl group of the repeat unit of formula 1 are substituted by an acid dissociable group selected from the group consisting of t-butyl, 1-methoxymethyl, 1-methoxyethyl, 1-ethoxyethyl, 1-cyclohexyloxyethyl, 1-ethoxypropyl, 1-propoxyethyl, trimethylsilyl, t-butoxycarbonyl, t-butoxycarbonylmethyl, tetrahydropyranyl, tetrahydrofuranyl, and combinations thereof.