Patent ID: 8906591

Claim:
A fluorine-free photoacid generator, said photoacid generator comprising: an onium cationic component, wherein said onium cationic component is selected from the group consisting of sulfonium cations and iodonium cations; and an anionic component having a structure of formula (I): wherein X is S; Y is N and G 1 is not present in the structure; and each of G 2 -G 5 is selected from the group consisting of H; linear, branched, tertiary, or cyclic alkyl; linear, branched, tertiary or cyclic alkoxyl; unsubstituted and substituted aromatic groups; and unsubstituted and substituted heteroaromatic groups and an electron withdrawing moiety, provided that at least one of G 2 -G 5 is an electron withdrawing moiety, wherein at least two of G 2 -G 5 are electron withdrawing moieties.