Patent ID: 6331466
Filing Date: 2001-12-18
Classification: H01L

Abstract:
A method of manufacturing an insulated gate type semiconductor device in which a plurality of insulated gate type semiconductor elements having trench gate are arranged substantially in a stripe form in a semiconductor base body, comprising the steps of:(a) preparing the semiconductor base body defining an upper main surface and a lower main surface and having a first semiconductor layer of a first conductivity type exposed on the upper main surface;(b) forming a second semiconductor layer of a second conductivity type exposed the upper main surface of said semiconductor base body in an upper surface portion of said first semiconductor layer by introducing impurity of the second conductivity type in the upper main surface of said semiconductor base body;(c) selectively introducing impurity of the first conductivity type in the upper main surface of said semiconductor base body to selectively form a third semiconductor layer of the first conductivity type exposed on the upper main surface in a lattice-like form in an upper surface portion of said second semiconductor layer;(d) selectively carrying out etching from the upper main surface of said semiconductor base body to form a trench which opens in said upper main surface, reaches said first semiconductor layer, and includes at least as a part thereof a plurality of trenches arranged substantially in a stripe form, each of said plurality of trenches opens along and inside a portion of the lattice-like exposed surface of said third semiconductor layer extending in a stripe form;(e) forming a first insulating film covering an inner wall of said trench and the upper main surface of said semiconductor base body;(f) burying a gate electrode in said trench covered with said first insulating film;(g) forming a second insulating film on said first insulating film and said gate electrode;(h) selectively applying etching to said second insulating film to selectively remove said second insulating film substantially in a zonal form interposed between adjacent said strip-like trenches, separated from the trenches and extending along the trenches;(i) forming a first conductor to cover said second insulating film and a portion from where it is removed; and(j) forming a second conductor on the lower main surface of said semiconductor base body.