Patent ID: 8809871

Claim:
A semiconductor element comprising: a semiconductor substrate of a first conductivity type; a first silicon carbide semiconductor layer of the first conductivity type which is arranged on the principal surface of the semiconductor substrate; a body region of a second conductivity type which is defined in the first silicon carbide semiconductor layer; an impurity region of the first conductivity type which is defined in the body region; a second silicon carbide semiconductor layer of the first conductivity type which is arranged on the first silicon carbide semiconductor layer so as to be at least partially in contact with the body region and the impurity region; a gate insulating film which is arranged on the second silicon carbide semiconductor layer; a gate electrode which is arranged on the gate insulating film; a first ohmic electrode which is electrically connected to the impurity region; and a second ohmic electrode which is arranged on the back surface of the semiconductor substrate, and wherein the body region of the second conductivity type includes a first body region that contacts with the surface of the first silicon carbide semiconductor layer and a second body region that contacts with the bottom of the body region of the second conductivity type, and wherein the average impurity concentration of the first body region is twice or more as high as the average impurity concentration of the second body region, and wherein the bottom of the impurity region is located at a deeper level than the bottom of the first body region.