Patent ID: 7736842
Filing Date: 2010-06-15
Classification: G03F,Y10S

Abstract:
1. A method for forming a resist pattern, comprising: applying a resist composition to a substrate, wherein said resist composition comprises a resin component (A) which exhibits changed alkali solubility under action of acid, and an acid generator component (B) that generates acid on exposure, wherein said component (A) comprises a copolymer having a structural unit (a1) represented by general formula (I) shown below, a structural unit (a2) represented by general formula (II) shown below, and a structural unit (a4) represented by general formula (IV) shown below: wherein R represents a hydrogen atom; wherein R represents a hydrogen atom, and R′ represents an acid dissociable, dissolution inhibiting group; and wherein R represents a hydrogen atom, R 4 represents a lower alkyl group, and n represents 0 or an integer of 1 to 3, and wherein said component (B) comprises at least one sulfonium compound selected from the group consisting of sulfonium compounds represented by general formula (b-1) or (b-2) shown below: wherein X represents an alkylene group having 2 to 6 carbon atoms, in which at least one hydrogen atom is substituted with a fluorine atom; each of Y and Z independently represents an alkyl group having 1 to 10 atoms, in which at least one hydrogen atom is substituted with a fluorine atom; each of R prebaking; conducting selective exposure or direct pattering with electron beam or extreme ultraviolet (EUV); conducting post-exposure baking (PEB); and performing alkali developing to form a resist pattern.