Patent ID: 6991890

Claim:
A negative photoresist composition, comprising: (a) a radiation sensitive acid generator, (b) an additive having the structure: wherein R 1 represents one of hydrogen, an alkyl group, an aryl group, a semi- or perfluorinated alkyl group, a semi- or perfluorinated aryl group, an alkaryl group, a semi- or perfluorinated alkaryl group, an aralkyl group, and a semi- or perfluorinated aralkyl group, wherein R 2 represents one of hydrogen and a straight or branched alkyl group with 1 to 50 carbons, wherein R 3 , R 4 , and R 5 independently represent one of hydrogen and a straight or branched alkyl group with 1 to 6 carbons; and (c) a resist polymer comprising a repeating first monomer unit derived from a first monomer comprising the structure: wherein M is a polymerizable backbone moiety, wherein Z represents one of —C(O)OR—, —C(O)R—, —OC(O)R—, —OC(O)—C(O)OR—, an alkylene group, an arylene group, a semi- or perfluorinated alkylene group, and a semi- or perfluorinated arylene group, wherein R represents one of an alkylene group, an arylene group, a semi- or perfluorinated alkylene group, and a semi- or perfluorinated arylene group, wherein p is 0 or 1, wherein the resist polymer is soluble in an aqueous alkaline developer solution, wherein the acid generator is adapted to generate an acid upon exposure to imaging radiation characterized by a wavelength, wherein the resist polymer is adapted to chemically react with the additive in the presence of the acid in a non-crosslinking chemistry to generate a product that is insoluble in the developer solution, and wherein R 1 is not adapted to chemically react with the resist polymer.