Patent ID: 6534225
Filing Date: 2003-03-18
Classification: G03F

Abstract:
A method for providing an alternating phase shift mask comprising the steps of:(a1) forming at least one opaque image on a surface of a substrate; (b1) forming a hardened, patterned first resist on portions of said substrate including said at least one opaque image, while leaving other portions of said substrate exposed; (c1) forming a patterned second resist so that at least one edge of said second resist is located in areas susceptible to printable step defects and reflowing said second resist to obtain a sloped profile at said at least one edge; (d1) transferring said sloped profile of said patterned second resist to said substrate, while maintaining a substantially vertical profile in said substrate beneath said at least one opaque image; and (e1) removing said first and second resists.