Patent ID: 8815492
Filing Date: 2014-08-26
Classification: G03F,Y10S

Abstract:
1. A chemically amplified positive resist composition for ArF immersion lithography, comprising (A) a triarylsulfonium 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propionate having the general formula (1-1): wherein Ar is a substituted or unsubstituted C 6 -C 20 aryl group which may contain a heteroatom, or a plurality of Ar groups may bond together directly or via an oxygen atom, methylene, sulfone or carbonyl moiety, (B) one or more acid generator having the general formula (1-2): wherein R 1 is a C 1 -C 30 alkyl, alkenyl or aralkyl group which may contain a heteroatom, R 2 is hydrogen or trifluoromethyl, and Ar is a substituted or unsubstituted C 6 -C 20 aryl group which may contain a heteroatom, or a plurality of Ar groups may bond together directly or via an oxygen atom, methylene, sulfone or carbonyl moiety, (C) a base resin having an acidic functional group protected with an acid labile group, which is insoluble or substantially insoluble in alkaline developer, but turns soluble in alkaline developer upon deprotection of the acid labile group, and (D) an organic solvent.