Patent ID: 8940602
Filing Date: 2015-01-27
Classification: H01L

Abstract:
1. A method of forming a FinFET device comprising, in the following order: forming a plurality of semiconductor fins from a bulk semiconductor substrate; forming an oxide layer between each of the plurality of semiconductor fins, the oxide layer extending from the bulk semiconductor substrate only part way up a sidewall of each of the semiconductor fins to cover a bottom portion of each of the semiconductor fins, a top portion of the sidewall of each of the semiconductor fins being exposed and not covered by the oxide layer; forming a dummy spacer on the exposed top portion of each of the semiconductor fins; completely stripping the oxide layer to expose the bulk semiconductor substrate and the bottom portion of each of the semiconductor fins; depositing a doping material to be in contact with the exposed bulk semiconductor substrate and the bottom portion of each of the semiconductor fins previously covered by the oxide layer; heat treating the bulk semiconductor substrate to drive in dopants from the doping material into the exposed bulk semiconductor substrate and the bottom portion of each of the semiconductor fins; stripping only the doping material; forming a second oxide layer only in contact with the exposed bulk semiconductor substrate and the bottom portion of each of the semiconductor fins previously contacted by the doping material; and stripping the dummy spacer from each of the semiconductor fins.