Patent ID: 7354692

Claim:
A lithographic photoresist composition, comprising: (a) an acid generator that generates a photoacid; (b) a photosensitizer that absorbs in the wavelength range of visible light above about 523 nm to an extent that it facilitates generation of the photoacid from the acid generator upon exposure to visible light; and (c) a polymer having acid-labile moieties; wherein the lithographic photoresist composition is suitable for use in a photolithographic process that does not require a post-exposure bake, and wherein the photosensitizer has the structure of formula (I): wherein: Ar 1 and Ar 2 are independently selected from monocyclic aryl and monocyclic heteroaryl, R 1 and R 2 may be the same or different, and have the structure â€”Xâ€”R 3 where X is O or S and R 3 is C 1 -C 6 hydrocarbyl or heteroatom-containing C 1 -C 6 hydrocarbyl, and R 4 and R 5 are independently selected from the group consisting of hydrogen and â€”Xâ€”R 3 , or, if ortho to each other, may be taken together to form a five- or six-membered aromatic ring, with the proviso that any heteroatom contained within Ar 1 , Ar 2 , or R 3 is O or S.