Patent ID: 8723259

Claim:
A silicon carbide semiconductor device comprising: a silicon carbide semiconductor substrate of a first conductivity type; a drift layer of a first conductivity type formed of silicon carbide and provided on a main surface of said silicon carbide semiconductor substrate; a cell region provided in a part of an upper layer of said drift layer; a well layer of a second conductivity type formed of silicon carbide and provided in another part of said upper layer of said drift layer; a semiconductor layer of said second conductivity type formed of silicon carbide and provided on said well layer or provided in an upper layer of said well layer; an insulating film provided on said semiconductor layer; and a gate electrode provided on said cell region and said insulating film, wherein said silicon carbide semiconductor device includes a MOSFET, and said semiconductor layer has a higher impurity concentration than said well layer and has a thickness of 100 nm or larger.