Patent ID: 7704808

Claim:
A method of forming a semiconductor-on-insulator (SOI) field effect transistor with body contact, comprising: forming a semiconductor substrate comprising a bulk semiconductor region, a sacrificial layer on the bulk semiconductor region and a semiconductor source/drain layer on the sacrificial layer; selectively etching through the semiconductor source/drain layer to define an opening therein and expose a portion of the sacrificial layer; selectively etching back a portion of the sacrificial layer to expose an underside surface of the semiconductor source/drain layer and define a gap between the semiconductor source/drain layer and the bulk semiconductor region; filling the gap and lining sidewalls of the opening in the semiconductor source/drain layer with an electrically insulating layer; selectively etching a portion of the electrically insulating layer in the opening to expose a portion of the bulk semiconductor region; epitaxially growing a first semiconductor active region from the exposed portion of the bulk semiconductor region; then selectively etching back the electrically insulating layer from within the opening in the semiconductor source/drain layer to expose sidewall portions of the semiconductor source/drain layer; epitaxially growing a second semiconductor active region that extends on the first semiconductor active region and on the exposed sidewall portions of the semiconductor source/drain layer; and forming an insulated gate electrode on the second semiconductor active region.