Patent ID: 9159846
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A SiC semiconductor device, comprising: a SiC semiconductor layer having a first-conductivity-type impurity; a field insulation film formed on a front surface of the SiC semiconductor layer and provided with an opening for exposing therethrough the front surface of the SiC semiconductor layer; an electrode connected to the SiC semiconductor layer through the opening of the field insulation film; and a guard ring having a second-conductivity-type impurity and being formed in a surface layer portion of the SiC semiconductor layer to make contact with an outer edge portion of the electrode within the opening, the second-conductivity-type impurity in a surface layer portion of the guard ring making contact with the electrode having a smaller impurity concentration than the first-conductivity-type impurity; wherein a boundary portion of the electrode overlaps with the guard ring in a plan view.