Patent ID: 6117621
Filing Date: 2000-09-12
Classification: G03F,Y10S

Abstract:
A method for patterning a chemically amplified positive resist material comprising applying a resist material comprising a base polymer having acid labile groups which are eliminated by acid, a photoacid generator and an organic solvent, onto a substrate to a uniform thickness of at least 1500 .ANG. so as to form a resist film which has dissolution rate properties giving the pattern formed therefrom high resolution and focal depth, and subsequently exposing, baking and then developing with a developer to form a positive pattern,wherein the base polymer comprises a mixture of at least two base polymers having mutually differing acid labile groups or is a base polymer having at least two mutually differing acid labile groups on the same molecule and wherein the types of said mutually differing acid labile groups and their contents within the base polymer are such that, when said chemically amplified positive resist material is applied onto a substrate to a uniform thickness so as to form a resist film that is subsequently exposed, baked, then developed with a developer, an exposure E1 which results in an average dissolution rate of 100 .ANG./s for 500 .ANG. from the surface of the resist film toward the substrate and an exposure E2 which results in an average dissolution rate of 100 .ANG./s for 1000 .ANG. from the surface of the substrate toward the resist film surface satisfy the relationship:-0.2<(E2-E1)/E2<0.2.