Patent ID: 6284414
Filing Date: 2001-09-04
Classification: G03F,Y10S

Abstract:
A method of making a phase-shifting mask for reduction projection exposure wherein an integrated circuit pattern is optically reduced and transferred onto a wafer, comprising:(a) preparing a mask substrate having a light-shielding film pattern over a major surface thereover, which light-shielding film pattern includes the integrated circuit pattern and an alignment mark;(b) after step (a), forming a resist film over the major surface of the mask substrate and the light-shielding pattern;(c) in accordance with the position of the alignment mark, aligning the position of a phase-shifting pattern to be patterned; and then(d) exposing the resist film by electron beam exposure, and thereby forming the phase-shifting pattern constituting the integrated circuit pattern together with the light-shielding pattern; and(e) removing the resist film.