Patent ID: 7332098
Filing Date: 2008-02-19
Classification: G03F

Abstract:
1. A method of fabricating a phase shift mask, comprising the steps of: forming a halftone layer on a transparent substrate; forming a first photoresist pattern on the halftone layer to define at least two areas; patterning the halftone layer using the first photoresist pattern so as to create a first halftone layer portion and a second halftone layer portion; removing the first photoresist pattern; forming a second photoresist pattern covering the first halftone layer portion, but not the second halftone layer portion on the transparent substrate; etching the second halftone layer portion and an exposed surface of the transparent substrate to a first thickness and a second thickness, respectively; and removing the second photoresist pattern, wherein the step of forming a second photoresist pattern includes forming a pair of inclined portions that cover respective sidewalls of the first halftone layer portion, said inclined portions having predetermined slopes.