Patent ID: 8329564
Filing Date: 2012-12-11
Classification: H01L

Abstract:
1. A method to fabricate a semiconductor device, comprising: providing a substrate comprised of crystalline silicon; implanting a ground plane in the crystalline silicon so as to be adjacent to a surface of the substrate, the ground plane being implanted to exhibit a desired super-steep retrograde well implant doping profile; annealing implant damage using a substantially diffusionless thermal annealing to maintain the desired super-steep retrograde well implant doping profile in the crystalline silicon; and performing a silicon epitaxy to deposit a silicon cap layer of undoped silicon over the surface of the substrate in order to provide an undoped channel region for the semiconductor device; and thereafter forming a shallow trench isolation structure, where formation of the shallow trench isolation structure after deposition of the silicon cap layer of undoped silicon enables the silicon cap layer to remain free of faceting.