Patent ID: 6054728
Filing Date: 2000-04-25
Classification: H01L

Abstract:
An insulated gate thyristor comprising:a first-conductivity-type base layer having a high resistivity;first and second second-conductivity-type base regions formed in selected portions of a surface layer of said first-conductivity-type base layer at a first major surface thereof;a first-conductivity-type source region formed in a selected portion of a surface layer of said first second-conductivity-type base region;a first-conductivity-type emitter region formed in a selected portion of a surface layer of said second second-conductivity-type base region;a gate electrode layer formed on a gate insulating film over a surface of said first second-conductivity-type base region, an exposed portion of said first-conductivity-type base layer, and a surface of said second second-conductivity-type base region, which surfaces and exposed portion are interposed between said first-conductivity-type source region and said first-conductivity-type emitter region;a first main electrode that contacts with both an exposed portion of said first second-conductivity-type base region and said first-conductivity-type source region;a second-conductivity-type emitter layer that is located between a second major surface of said first-conductivity-type base layer and a second main electrode that contacts with said second-conductivity-type emitter layer;a gate electrode that contacts with said gate electrode layer; andan insulating film covering entire areas of surfaces of said second second-conductivity-type base region and said first-conductivity-type emitter region,wherein an exposed surface portion of said first second-conductivity-type base region that is interposed between said first-conductivity-type base layer and said first-conductivity-type source region has a smaller width than an exposed surface portion of said second second-conductivity-type base region interposed between said first-conductivity-type base layer and said first-conductivity-type emitter region.