Patent ID: 8440516

Claim:
A method of forming a field effect transistor, comprising: providing a substrate comprising a strained layer of a semiconductor material; forming a mask on said layer of semiconductor material, said mask having an opening; forming a recess in a portion of said layer of semiconductor material exposed at a bottom of said opening; forming a layer of an insulating material on said exposed portion of said layer of semiconductor material; filling said opening with a gate electrode material; selectively removing said mask, wherein said gate electrode material in said opening substantially remains on said substrate to form a gate electrode; implanting ions of a dopant material into portions of said layer of semiconductor material located adjacent said gate electrode, wherein a penetration depth of said ions in said implantation is less than a depth of said recess so that a source side channel contact region and a drain side contact region located adjacent a channel region beneath said gate electrode are not irradiated with ions of said dopant material; and performing an annealing process to induce a diffusion of said dopant material into said source side channel contact region and said drain side channel contact region.