Patent ID: 7566527
Filing Date: 2009-07-28
Classification: G03F,Y10S

Abstract:
1. A method for forming a patterned feature on a substrate, comprising: providing a composition free of a polymeric component having an acid-inert backbone structure, said composition comprising a photosensitive acid generator and a linked molecular glass having two fused polycyclic moieties and at least one hydroxyl group protected by a methoxycyclohexyl group, said two fused polycyclic moieties comprising wherein p is 7, said linked molecular glass comprising three molecular glass moieties linked via acid cleavable acetal linkages between adjacent molecular glass moieties, said photosensitive acid generator comprising N-hydroxy-naphthalimide, said linked molecular glass having a molecular weight less than about 100,000 g/mole, said composition further comprising a fluorine containing surfactant and a base quencher comprising an aliphatic amine; dip coating a film of said composition onto said substrate, said substrate comprising a silicon wafer having an organic underlayer and a silsesquioxane polymer film spin coated thereon; patternwise imaging said film, wherein at least one region of said film is exposed to an electron beam, resulting in production of an acid catalyst in said at least one exposed region of said film, resulting in acid catalyzed bond cleavage reactions occurring at said acid cleavable acetal linkages; after said imaging, baking said film on said substrate at a temperature in a range from about 90° C. to about 160° C.; after said baking, developing said film in an aqueous base solution, resulting in removal of base-soluble exposed regions of said film, wherein a patterned feature from said film remains following said removal; and after said developing, transferring said patterned feature to said substrate, said transferring achieved by a wet etching technique.