Patent ID: 6844224

Claim:
A method for forming a contact to a semiconductor substrate of a first conductivity type, comprising: providing a semiconductor stack including an active layer formed on a first insulator layer and a masking layer over the active layer, wherein the first insulator layer is formed on the semiconductor substrate and wherein the active layer and the masking layer are patterned to have an opening; implanting the semiconductor substrate through the opening and the first insulator layer with a first species to form a first doped region within the semiconductor substrate, wherein the first doped region is the first conductivity type and is heavily doped, and wherein the masking layer operates as a mask to the implanting; after the implanting, forming a gate dielectric on the active layer; forming a gate electrode on the gate dielectric; forming a source region in the active layer adjacent a first side of the gate electrode; forming a drain region in the active layer adjacent a second side of the gate electrode, wherein the second side is opposite the first side; and forming a first contact electrically connected to the first doped region.