Patent ID: 6127099
Filing Date: 2000-10-03
Classification: H01L

Abstract:
A method of producing a semiconductor device comprising the steps in sequence of:(a) forming a metallic wiring pattern on a semiconductor substrate;(b) forming an insulating film on said metallic wiring pattern;(c) forming a polyimide film on said insulating film;(d) patterning said polyimide film to thereby form a polyimide pattern;(e) subjecting said polyimide pattern to a first heat treatment of 130.degree. C. to 170.degree. C. to evaporate any solvent contained in said polyimide film;(f) selectively etching said insulating film by using said polyimide pattern as a mask;(g) following step (f), oxygen ashing a surface of said polyimide pattern by oxygen plasma; and(h) following step (g), subjecting said polyimide pattern to a second heat treatment of 300.degree. C. to 400.degree. C. to harden said polyimide whereby to reform imide coupling dissociated by the oxygen ashing step.