Patent ID: 9653599
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a first silicon carbide semiconductor layer of a first conductivity type; a first semiconductor region of a second conductivity type, selectively disposed in the first silicon carbide semiconductor layer so that an upper surface of the first semiconductor region is disposed lower than an upper surface of the first silicon carbide semiconductor layer; a second silicon carbide semiconductor layer of the second conductivity type, disposed on the upper surface of the first silicon carbide semiconductor layer; a second semiconductor region of the first conductivity type, selectively disposed in the second silicon carbide semiconductor layer; a first trench penetrating the second semiconductor region and the second silicon carbide semiconductor layer so as to reach the first silicon carbide semiconductor layer; a second trench disposed away from the first trench in a plan view, the second trench penetrating the second semiconductor region and the second silicon carbide semiconductor layer so as to reach the first semiconductor region through the first silicon carbide semiconductor layer; a gate insulating film formed on a side wall of the first trench; a gate electrode disposed inside the first trench and formed on the gate insulating film; and a metal electrode embedded inside the second trench so as to contact the second semiconductor region and the second silicon carbide semiconductor layer as well as to contact the first semiconductor region at a bottom portion and a corner portion of the second trench so as to form a Schottky junction with the first silicon carbide semiconductor layer, in a side wall of the second trench.