Patent ID: 9075306
Filing Date: 2015-07-07
Classification: G03F

Abstract:
1. A resist pattern forming process comprising the steps of: applying a chemically amplified negative resist composition onto a substrate having a surface composed of a chromium compound optionally containing oxygen and/or nitrogen to form a coating, heating the coating, exposing the coating to soft x-ray or electron beam, post-exposure heating the coating, and developing the coating with an aqueous alkaline solution, said chemically amplified negative resist composition consisting of: 100 parts by weight of a polymer comprising recurring units having the general formula (5): wherein R 1 and R 2 are each independently hydrogen or methyl, R 3 and R 4 are each independently hydrogen, optionally substituted hydroxyl, or halogen, X is an electron withdrawing group selected from the group consisting of halogen atoms, m is 0 or an integer of 1 to 4, n is an integer of 1 to 5, u is 0 or an integer of 1 to 5, p, q and r are positive numbers satisfying p+q+r<1, said polymer having a weight average molecular weight of 1,000 to 50,000; 2 to 30 parts by weight of a photoacid generator; 2 to 40 parts by weight of a crosslinker which reacts with the polymer to induce intramolecular and intermolecular crosslinkage under the catalysis of an acid generated by the photoacid generator; 0 to 20 parts by weight of a basic compound; 300 to 2,000 parts by weight of an organic solvent; and up to 1 part by weight of a surfactant, wherein the crosslinker is selected from the group consisting of tetramethoxymethylglycoluril, 1,3-bismethoxymethyl-4,5-bismethoxyethylene urea, bismethoxymethyl urea, hexamethoxymethylmelamine, or hexaethoxymethylmelamine; and the photoacid generator is selected from the group consisting of sulfonium salts, iodonium salts, sulfonyldiazomethane and N-sulfonyloxyimide photoacid generators, wherein a sulfonium cation of the sulfonium salts is selected from the group consisting of triphenylsulfonium, (4-tert-butoxyphenyl)diphenylsulfonium, bis(4-tert-butoxyphenyl)pheynylsulfonium, tris(4-tert-butoxyphenyl)sulfonium, (3-tert-butoxyphenyl)diphenylsulfonium, bis(3-tert-butoxyphenyl)phenylsulfonium, tris(3-tert-butoxyphenyl)sulfonium, (3,4-di-tert-butoxyphenyl)diphenylsulfonium, bis(3,4-di-tert-butoxyphenyl)phenylsulfonium, tris(3,4-di-tert-butoxyphenyl)sulfonium, diphenyl(4-thiophenoxyphenyl)sulfonium, (4-tert-butoxycarbonylmethyloxyphenyl)diphenylsulfonium, tris(4-tert-butoxycarbonylmethyloxyphenyl)sulfonium, (4-tert-butoxyphenyl)bis(4-dimethylaminophenyl)sulfonium, tris(4-dimethylaminophenyl)sulfonium, 2-naphthyldiphenylsulfonium, dimethyl-2-naphthylsulfonium, 4-hydroxyphenyldimethylsulfonium, 4-methoxyphenyldimethylsulfonium, trimethylsulfonium, 2-oxocylcohexylcyclohexylmethylsulfonium, trinaphthylsulfonium, and tribenzylsulfonium, and an iodonium cation of the iodonium salts is selected from the group consisting of diphenyliodinium, bis(4-tert-butylphenyl)iodonium, 4-tert-butoxyphenylphenyliodonium, and 4-methoxyphenylphenyliodonium.