Patent ID: 9184056
Filing Date: 2015-11-10
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the steps of: preparing a semiconductor substrate including a drift layer having a first conductivity type and a body layer having a second conductivity type, which is formed on said drift layer to include one main surface; forming a trench to open on a side of said one main surface and to penetrate said body layer and reach said drift layer; forming a first insulating film to include a wall surface of said trench; forming a gate electrode to be in contact with said first insulating film; and forming a first interconnection on said one main surface, in said step of forming a trench, an outer peripheral trench arranged to surround an active region when viewed two-dimensionally being formed, and in said step of forming a first interconnection, said first interconnection being formed to lie over said active region when viewed two-dimensionally and to electrically be connected to a potential fixing region which is said body layer exposed at said one main surface opposite to said active region when viewed from said outer peripheral trench, said active region is formed on said one main surface of said semiconductor substrate; and said active region includes a source region which is electrically connected to said first interconnection.