Patent ID: 8900936

Claim:
A method for forming a fin field-effect transistor (finFET) device, comprising: providing one buried oxide layer, a fin, a gate, and first spacers, where the fin is on top of and in contact with the one buried oxide layer, the gate is on top of the fin, and the first spacers are on top of the fin to either side of the gate; doping the fin to form extension junctions, wherein each extension junction extends under the gate and a region of the fin under the gate remains undoped; forming second spacers on top of the extension junctions, wherein each second spacer is adjacent to one of the first spacers to either side of the gate; etching back the extension junctions and portions of the one buried oxide layer that are not protected by the gate, the first spacers, and the second spacers, thus creating voids, where the portions of the one buried oxide layer that are etched back are etched back partially in height and not completely in height; and filling the voids with a semiconductor or conductor material such that a top surface of the semiconductor or conductor material is flush with top surfaces of the extension junctions; and etching back the semiconductor or conductor material that has filled the voids so that the top surface of the semiconductor or conductor material extends below the top surfaces of the extension junctions, thus forming recessed source-drain regions.