Patent ID: 7256453

Claim:
A semiconductor device, comprising: a silicon carbide semiconductor substrate having a low impurity-density first conductivity type; a first region formed on a first major surface of said substrate and having a second conductivity type and a resistance lower than that of said substrate; a control electrode formed under said first region; a second region formed on a second major surface of said substrate and having the same conductivity type as, and a resistance lower than, that of said substrate; a second electrode formed on said second region; a third region formed on the second major surface of said substrate and having the same conductivity type as, and a resistance lower than, that of the substrate; and a third electrode formed on said third region, wherein said third region is formed in a region formed by removing a substrate region except said second region, a surface of said third region is at a level lower than a bottom of said second region, said third region is contiguous to a first region, and said second region is formed such that it is exposed on a part of said second major surface.