Patent ID: 7829898

Claim:
A semiconductor device comprising: a semiconductor substrate having a first conductivity type and having main and lower surfaces; a drift layer, having the first conductivity type and a surface, said drift layer being located on the main surface of said semiconductor substrate; a base region having a second conductivity type and located within a portion of said drift layer, said base region having a depth in said drift layer and a surface; a source region having the first conductivity type and located within said base region at a portion of said base region, said source region having a depth shallower than the depth of said base region and a surface; a channel layer having the second conductivity type and located on and contacting the surface of said source region, and located on and contacting a part of the surface of said drift layer, with at least part of said source region located between said channel layer and said drift layer, for electrically connecting said source region to said drift layer via a channel produced in an on-state of said semiconductor device, the channel layer having a surface; an insulating film located on the surface of said channel layer, said insulating film having a surface; a gate electrode located on the surface of said insulating film; a source electrode located on the surface of said base region and the surface of said source region; and a drain electrode located on the lower surface of said semiconductor substrate.