Patent ID: 7595238

Claim:
A method for manufacturing a trench MOS type SiC semiconductor device, comprising the steps of: providing a first conductivity type semiconductor substrate, forming a first conductivity type drift layer on the first conductivity type semiconductor substrate, forming a second conductivity type base layer on the first conductivity type drift layer, forming a first conductivity type source layer on the second conductivity type base layer, forming a stripe shaped trench reaching from the surface of the first conductivity type source layer to the first conductivity type drift layer, forming a second conductivity type layer on the bottom of the stripe shaped trench, forming a second conductivity type region on the second conductivity type layer and on across-the-width side walls of at least a first end of the stripe shaped trench, and using the second conductivity type region so as to electrically couple the second conductivity type layer with the second conductivity type base layer, and forming a gate oxide film and then a gate electrode in said trench.