Patent ID: 7834362

Claim:
A SiC bipolar type semiconductor device comprising: a SiC substrate of an n-type or a p-type, and at least one SiC epitaxial layer of an n-type or a p-type or at least one ion implanted layer of an n-type or a p-type; a region around a p-n junction interface which is a region within 500 nm from the p-n junction interface and a region in a conductivity modulation layer, in which no carbon implanted layer, no silicon implanted layer, no hydrogen implanted layer, or no helium implanted layer is formed; a carbon implanted layer, a silicon implanted layer, a hydrogen implanted layer, or a helium implanted layer in at least one of regions around the surface of the SiC substrate, around an interface of the SiC substrate and the SiC epitaxial layer, and around the surface of the SiC epitaxial layer, except for the region around the p-n junction interface and the region in the conductivity modulation layer; and a region in which electrically active point defects are reduced by diffusing out carbon interstitials that have been introduced by ion implantation of carbon atoms, silicon atoms, hydrogen atoms, or helium atoms into the conductivity modulation layer by annealing, and by combining the carbon interstitials and point defects in the conductivity modulation layer.