Patent ID: 7508045

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type formed of SiC and having a first surface and a second surface; a semiconductor layer of the first conductivity type formed of SiC and on the first surface of the semiconductor substrate, an impurity concentration of the semiconductor layer being lower than that of the semiconductor substrate; a first electrode formed on the semiconductor layer and forming a Schottky junction with the semiconductor layer, a barrier height of the Schottky junction being 1 eV or less; a plurality of junction barriers of a second conductivity type formed to contact the first electrode and each having a depth d 1 from an upper surface of the semiconductor layer, a width w, and a space s between adjacent ones of the junction barriers; an edge termination region of the second conductivity type formed outside the junction barriers to contact the first electrode and having a depth d 2 from the upper surface of the semiconductor layer; and a second electrode formed on the second surface of the semiconductor substrate, wherein following relations are satisfied: d 1/ d 2≧1; s/d 1≦0.6; and s /( w+s )≦0.33.