Patent ID: 7407837

Claim:
A method of manufacturing a SiC semiconductor device, the SiC semiconductor device including a SiC substrate of a first conductivity type; a SiC drift layer of the first conductivity type on the substrate; SiC base regions of a second conductivity type contacting with the drift layer; a SiC source region of the first conductivity type contacting with the base region; a gate electrode covering the portion of the base region that is sandwiched between the drift layer and the source region, with a gate insulator film interposed therebetween; a source electrode contacting commonly with the base region and the source region; and a drain electrode on the back surface of the substrate, the method comprising exerting stress to SiC in the region where carriers flow in order to change the crystal lattice intervals of the SiC by forming a nitride film comprising at least one of AlN and GaN on the sandwiched portion of the base region and forming a SiC layer comprising the region where carriers flow on the nitride film, in order to exert stress on the SiC in the region where carriers flow and thereby change the crystal lattice intervals of the SiC layer comprising the region where carriers flow.