Patent ID: 8847238

Claim:
A semiconductor device, comprising: a semiconductor substrate; a semiconductor layer provided on a principal surface of the semiconductor substrate and including a drift region of a first conductivity type, a body region of a second conductivity type provided at a position next to the drift region, and an impurity region of a first conductivity type provided at a position next to the body region; an epitaxial layer in contact with the body region; a gate insulating film provided at a position facing the body region with the epitaxial layer interposed therebetween; and a gate electrode provided at a position facing the epitaxial layer with the gate insulating film interposed therebetween, wherein the epitaxial layer includes an interface epitaxial layer in contact with the body region, a first epitaxial layer in contact with the interface epitaxial layer, and a second epitaxial layer in contact with the first epitaxial layer, and a first conductivity type impurity concentration of the interface epitaxial layer is higher than a first conductivity type impurity concentration of the first epitaxial layer, and lower than a first conductivity type impurity concentration of the second epitaxial layer.