Patent ID: 7029969

Claim:
A method of manufacturing a silicon carbide (SiC) vertical MOSFET, the method comprising: forming an SiC mask on a surface of an epitaxial layer of SiC, the SiC mask having a tapered shape in cross-section, with side surfaces forming an angle with respect to a normal to the surface of the epitaxial layer of SiC in a range from 30° to 60°; implanting first ions into the epitaxial layer of SiC through the surface, using the SiC mask as an ion implantation mask, to produce a base region having a first conductivity type in the epitaxial layer of SiC; and implanting second ions into the epitaxial layer of SiC through the surface, using the SiC mask as an ion implantation mask, to produce a source region having a second conductivity type, opposite the first conductivity type, within the base region, so that at least the base region has an interface forming an angle with respect to the normal to the surface in a range from 30° to 60°.