Patent ID: 6022767
Filing Date: 2000-02-08
Classification: H01L

Abstract:
A method of fabricating a semiconductor device, comprising the steps of:(a) forming a first insulating film on a semiconductor region;(b) forming said semiconductor region with a recess;(c) forming a gate insulating film on an inner wall of said recess;(d) forming a polysilicon film so that said recess is filled with said polysilicon film;(e) etching back said polysilicon film so that a gate electrode having a thickness smaller than a depth of said recess is formed in said recess;(f) oxidizing said gate electrode at its surface with said first insulating film being used as a mask, to thereby form a second insulating film on said gate electrode;(g) forming a base region at a surface of said semiconductor region with said second insulating film being used as a mask so that said base region has a thickness smaller than a depth of said recess, said base region having an electrical conductivity different from that of said semiconductor region;(h) forming a source region at a surface of said base region with said second insulating film being used as a mask, said source region having the same electrical conductivity as that of said semiconductor region;(i) exposing said base and source regions with said second insulating film being used as a mask; and(j) forming a source electrode over said second insulating film, said base region, and said source region.