Patent ID: 6894346

Claim:
A semiconductor device having a band gap of 2.0 eV or higher and having a pair of major surfaces, comprising: a 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 a surface of said third region is at a level lower than a bottom of said second region and said third region is contiguous to a first region.