Patent ID: 8409782

Claim:
A photoresist composition comprising two photoinitiators having different activation wavelengths whose difference is from 20 nm to 100 nm, wherein the two photoinitiators are present in a ratio of 1:3 to 3:1, and wherein the two photoinitiators are 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one and hexaaryl bisimidazole; 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one and 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one; 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one and bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide; 1-[9-ethyl-6-(2-methylbenzyl)-9H-carbazol-3-yl]ethanone-1-(O-acetyloxime) and 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one; or 1-[9-ethyl-6-(2-methylbenzyl)-9H-carbazol-3-yl]ethanone-1-(O-acetyloxime) and bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide.