Patent ID: 8659057

Claim:
A semiconductor device comprising: a substrate layer of a semiconductor material of a first conductivity type; a channel layer of a semiconductor material of the first conductivity type above an upper surface of the substrate layer, the channel layer comprising one or more raised regions extending upward from adjacent surfaces of the channel layer, the one or more raised regions each comprising an upper surface and first and second sidewalls, wherein the first and second sidewalls of the one or more raised regions taper inward to form an angle of at least 5° from vertical to the upper surface of the substrate layer, wherein the one or more raised regions each comprises implanted regions of a semiconductor material doped with dopants that impart, to the semiconductor material of the raised regions, conductivity of a second conductivity type different than the first conductivity type, wherein each of the implanted regions is adjacent to respective of the first and second sidewalls and extends beneath a respective of the adjacent surfaces of the channel layer to form a gate region; and a source layer of a semiconductor material of the first conductivity type on the upper surface of each of the one or more raised regions; wherein the implanted regions of the one or more raised regions are downwardly offset from respective of the source layers such that the dopants that impart conductivity of a second conductivity type are not implanted within the respective of the source layers.