Photoacid generator and photoresist comprising same

Abstract

A photoacid generator includes those of formula (I): wherein each Ra in formula 1 is independently H, F, a C1-10 nonfluorinated organic group, C1-10 fluorinated organic group, or a combination comprising at least one of the foregoing, provided at least one Ra is F or a C1-10 fluorinated organic group, the C1-10 fluorinated and nonfluorinated organic groups each optionally comprising O, S, N, or a combination comprising at least one of the foregoing heteroatoms; L1 is a linking group comprising a heteroatom comprising O, S, N, F, or a combination comprising at least one of the foregoing; G+ is an onium salt of the formula (II): wherein in formula (II), X is S or I, each R0 is independently C1-30 alkyl group; a polycyclic or monocyclic C3-30 cycloalkyl group; a polycyclic or monocyclic C4-30 aryl group; or a combination comprising at least one of the foregoing, provided at least one R0 is substituted where each R0 is a C6 monocyclic aryl group, and wherein when X is I, a is 2, and where X is S, a is 3, p is 0 or 1, and q is an integer of from 1 to 10.

Dependencies are inferred from the claim text.