Patent ID: 8466017

Claim:
A method of making a semiconductor device, the method comprising: patterning an etch mask above an implant mask layer, wherein the implant mask layer is above a channel layer of a semiconductor material of a first conductivity type and wherein the channel layer is above an upper surface of a semiconductor substrate of the first conductivity type; selectively etching through the etch mask to etch portions of the implant mask layer and the channel layer and thereby define raised regions each having an upper surface and sidewalls adjacent to respective of the etched portions, the etched portions each defined by a respective bottom surface; implanting ions into the channel layer through the etched portions of the implant mask layer to form implanted regions of a second conductivity type in the semiconductor material beneath the bottom surfaces of the etched portions of the channel layer, wherein the ions are implanted at an angle within +/−10° from perpendicular to the upper surface of the semiconductor substrate and wherein sufficient ions impinging on the implant mask layer during the implanting are scattered by the implant mask to +dope implanted regions of the second conductivity type adjacent the sidewalls of the channel layer in the raised regions, wherein the implanted regions beneath the bottom surface of the etched portions are connected to the implanted regions adjacent the sidewalls of the channel layer in the raised regions.