Patent ID: 8952393
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A silicon carbide semiconductor device comprising: a first electrode; a first drift layer that has a first surface facing said first electrode and electrically connected to said first electrode and a second surface opposite to said first surface, that has first conductivity type, and that has an impurity concentration N a relaxation region that is provided in a portion of said second surface of said first drift layer, that has a distance L a second drift layer that has a third surface in contact with said second surface and a fourth surface opposite to said third surface, and that has said first conductivity type, said first drift layer and said second drift layer forming a drift region in which said relaxation region is buried, said second drift layer having an impurity concentration N a body region that is provided on said fourth surface of said second drift layer and that has said second conductivity type; a source region that is provided on said body region, that is separated from said drift region by said body region, and that has said first conductivity type; a second electrode electrically connected to said source region; a gate insulating film including a portion on said body region to connect said source region and said second drift layer to each other; and a gate electrode provided on said gate insulating film, a trench being provided to have a side wall surface extending into said second drift layer through said source region and said body region and separated from said first drift layer, a gate insulating film being formed to cover the side wall surface and a bottom surface of said trench.