Patent ID: 6899989

Claim:
A positive-tone radiation-sensitive resin composition comprising: (A) a photoacid generator which is a compound comprising a structure shown by the following formula (1-a) and a structure shown by the following formula (1-b), wherein the groups R 1 to R 15 individually represent a hydrogen atom, a hydroxyl group, a linear, branched, or cyclic alkyl group having 1-10 carbon atoms, a linear, branched, or cyclic alkoxyl group having 1-10 carbon atoms, or a t-butoxycarbonylmethoxy group, provided that two or more of the groups R 1 to R 5 are groups other than the hydrogen atom, two or more of the groups R 6 to R 10 are groups other than the hydrogen atom, or two or more of the groups R 11 to R 15 are groups other than the hydrogen atom; and the groups R 16 to R 20 individually represent a hydrogen atom, fluorine atom, or trifluoromethyl group, provided that at least one of the groups R 16 to R 20 is a fluorine atom or trifluoromethyl group, and (B) a resin comprising a recurring unit shown by the following formula (2), wherein R 21 represents a methyl group or ethyl group, and R 22 represents a linear, branched, or cyclic alkyl group having 1-6 carbon atoms, and a recurring unit shown by the following formula (3) wherein the structure represented by the formula (1-a) is at least one structure selected from the group consisting of 2,4-dimethylphenyldiphenylsulfonium cation, 2,6-dimethylphenyldiphenylsulfonium cation, 2,4,6-trimethylphenyldiphenylsulfonium cation, 2,4,6-triethylphenyldiphenylsulfonium cation, 2,4,6-tri-i-propylphenyldiphenylsulfonium cation, 2,4-di-t-butoxyphenyldiphenylsulfonium cation, 2,4-di-t-butoxycarbonylmethoxyphenyldiphenylsulfonium cation, 4-t-butoxy-2,6-dimethylphenyldiphenylsulfonium cation, and 4-t-butoxycarbonylmethoxy-2,6-dimethylphenyldiphenyl-sulfonium cation.