Patent ID: 8536347

Claim:
A photoacid generator represented by Formula 2: wherein: R 1 is a C 1-C 10 alkyl group, X is a C3-C20 alicyclic hydrocarbon group forming a ring with S + , CH 2 groups in the alicyclic hydrocarbon group are unsubstituted, and at least one CH 2 group in the alicyclic hydrocarbon group is replaced with at least one of S, O, NH, a carbonyl group, or a R 5 —S + A − moiety represented by Formula 2a, where, in Formula 2a, * is a site where the R 5 —S + A − moiety is bonded in the ring, and R 5 is a C1-C10 alkyl group, and in Formulae 2 and 2a, A − is a C1-C30 organic sulfonate ion substituted with F or NH 2 .