Patent ID: 7803521
Filing Date: 2010-09-28
Classification: G03F

Abstract:
1. A method of forming patterned structure, said method comprising: (a) dispensing a chemically amplified positive photoresist formulation over a top surface of a substrate or a top surface of a fabrication layer formed on said substrate and removing a casting solvent by pre-exposure baking said photoresist formulation to form a photoresist layer, said photoresist formulation comprising a mixture of said casting solvent, a terpolymer or tetrapolymer dissolved in said casting solvent, and a photoacid generator; after (a), (b) patternwise exposing said photoresist layer to actinic radiation to form exposed photoresist layer; after (b), (c) developing said exposed photoresist layer in an aqueous base solution to selectively remove regions of said photoresist layer exposed to said actinic radiation to form a patterned photoresist layer; after (c), (d) post-develop baking said patterned photoresist layer at a temperature of about 150° C. or greater, after said post develop baking, said terpolymer or tetrapolymer being substantially insoluble in said casting solvent; and (e) forming a non photoresist layer over a top surface of said patterned photoresist layer and (i) regions of said top surface of said substrate or (ii) regions of a top surface of said fabrication layer where said substrate or layer is not covered by said patterned photoresist layer, said non photoresist layer comprising a second polymer.