Patent ID: 8431974

Claim:
A semiconductor device comprising: a silicon carbide substrate of a first conductivity type or a second-conductivity type having a first main surface and a second main surface opposite to each other; a silicon carbide layer of the first conductivity type formed on the first main surface of the silicon carbide substrate; a first silicon carbide region of the second conductivity type formed on a surface of the silicon carbide layer; a second silicon carbide region of the first conductivity type formed within a surface of the first silicon carbide region; a gate dielectric continuously formed in contact with the silicon carbide layer, a part of the second silicon carbide region and the surface of the first silicon carbide region interposed between the silicon carbide layer and the second silicon carbide region; a gate electrode formed on the gate dielectric; a first electrode embedded in a trench selectively formed in a boarding area of the first silicon carbide region and another part of the second silicon carbide region uncovered with the gate dielectric, a bottom of the trench being placed on an area including a part crossing a junction between the first silicon carbide region and the second silicon carbide region; and a second electrode formed on the second main surface of the silicon carbide substrate.