Patent ID: 6111290
Filing Date: 2000-08-29
Classification: H01L

Abstract:
A semiconductor device comprising an insulated gate bipolar transistor of a gate trench type having a high breakdown voltage comprising:a semiconductor substrate of a first conductivity type having first and second main surfaces;gate trenches, each having a first groove formed at a predetermined region of said first main surface and extending from said first main surface into said semiconductor substrate to a depthwise direction, a gate insulating film covering an inner surface of said first groove, and an electrode filling said first groove and made of an electrical conductor;an impurity region of the first conductivity type formed near said first main surface and located in the vicinity of said gate trench;a first main electrode layer covering said first main surface, opposed to said gate trench with an insulating film therebetween and electrically connected to said impurity regions and said semiconductor substrate;a second impurity layer of the second conductivity type formed at said second main surface; anda second main electrode layer formed at a surface of said second impurity layer, wherein each gate trench is spaced from another gate trench with a predetermined pitch, and a plurality of emitter trenches, not gate trenches, arranged between two gate trenches, each emitter trench having a second groove extending from said first main surface into said semiconductor substrate in a depthwise direction, an insulating film covering an inner surface of said second groove and second electrode filling said second groove are arranged at positions between said gate trenches, wherein a surface of the impurity region of the first conductivity type formed near the main surface exposed between emitter trenches is covered with an interlayer insulating film.