Patent ID: 8227854
Filing Date: 2012-07-24
Classification: H01L

Abstract:
1. A semiconductor device including a cell section configured to pass main electrical current and a edge termination section surrounding the cell section, the semiconductor device comprising: a first semiconductor layer of a first conductivity type; a first main electrode connected to the first semiconductor layer; a drift layer formed on the first semiconductor layer, the drift layer including a first semiconductor pillar layer of the first conductivity type and a second semiconductor pillar layer of a second conductivity type alternately arranged parallel to an upper surface of the first semiconductor layer; a semiconductor base layer of the second conductivity type selectively formed in a surface of the drift layer so as to be connected to the second semiconductor pillar layer; a semiconductor source layer of the first conductivity type selectively formed in a surface of the semiconductor base layer; a gate insulating film provided above the drift layer; a gate electrode insulated from the drift layer and the base layer by the gate insulating film; an insulating film provided on the surface of the drift layer in the edge termination section; a second main electrode electrically connected to the semiconductor base layer and the semiconductor source layer; a first semiconductor RESURF layer of the second conductivity type formed in the surface of the drift layer in the edge termination section and connected to the semiconductor base layer, the first semiconductor RESURF layer being wider in a direction from an inner peripheral portion of the edge termination section toward an outer peripheral portion of the edge termination section than in a direction perpendicular to the upper surface of the first semiconductor layer; and a second semiconductor RESURF layer of the first conductivity type disposed between the first semiconductor RESURF layer and the insulating film, and being in contact with the first semiconductor RESURF layer.