Patent ID: 6548220
Filing Date: 2003-04-15
Classification: C07C,C07D,G03F,Y10S

Abstract:
A chemical amplifying type positive resist composition which comprises:(A) an acid generator containing (a) a sulfonium salt represented by the following formula (I): â€ƒwherein Q1 and Q2 each independently represent a straight chain or branched alkyl group having from 1 to 6 carbon atoms or a cycloalkyl group having from 3 to 10 carbon atoms, or Q1 and Q2 form, together with a sulfur atom to which Q1 and Q2 are adjacent, a heteroalicyclic group which may further contain an oxygen atom and a sulfur atom; Q3 represents a hydrogen atom, Q4 represents a straight chain or branched alkyl group having from 1 to 6 carbon atoms or a cycloalkyl group having from 3 to 10 carbon atoms, or Q3 and Q4 form, together with a CHC(O) group to which Q3 and Q4 are adjacent, a 2-oxocycloalkyl group; and Q5SO3âˆ’ represents an organosulfonate ion, provided that when Q5 represents a perfluoroalkyl group having from 1 to 8 carbon atoms, there is excluded the case where Q1 represents a straight chain or branched alkyl group having from 1 to 6 carbon atoms, Q2 represents a straight chain or branched alkyl group having from 1 to 6 carbon atoms, or a cycloalkyl group having from 3 to 10 carbon atoms, and Q3 and Q4 represent, together with their adjacent CHC(O) group, a 2-oxocycloalkyl group, and (b) at least one onium salt selected from a triphenylsulfonium salt represented by the following formula (IIa), and a diphenyliodonium salt represented by the following formula (IIb): â€ƒwherein P1 to P5 each independently represent hydrogen, a hydroxyl group, an alkyl group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms; and P6SO3âˆ’ and P7SO3âˆ’ each independently represent an organosulfonate ion; and (B) a resin which has a polymerization unit having a group unstable against an acid, and is alkali-insoluble or -slightly soluble itself, but is converted to alkali-soluble by the action of an acid.