Patent ID: 6106981
Filing Date: 2000-08-22
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, which comprises:(a) forming a first resist film over a major surface of a mask substrate having a light shielding film;(b) exposing the first resist film by electron beam exposure, and thereby patterning the light shielding film so as to form a light shielding pattern for forming the integrated circuit pattern and forming an alignment mark;(c) removing the first resist film;(d) after step (c), forming a second resist film over the major surface of the mask substrate and the light shielding pattern;(e) in accordance with the position of the alignment mark, aligning the position of a phase shifting pattern to be patterned; and then(f) exposing the second 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(g) removing the second resist film.