Patent ID: 6974730

Claim:
A method for forming a recessed channel field effect transistor device comprising: providing a semiconductor substrate; forming a first sacrificial layer upon the semiconductor substrate; forming a pair of source/drain regions in the semiconductor substrate while employing the first sacrificial layer as a mask; forming a pair of second sacrificial layers overlying the pair of source/drain regions and adjoining the first sacrificial layer; removing the first sacrificial layer to form an aperture which exposes the semiconductor substrate; etching the semiconductor substrate exposed within the aperture to form an elongated aperture; forming adjoining a pair of sidewalls of the elongated aperture a pair of sacrificial sidewall spacer layers, forming at the bottom of the elongated aperture a gate dielectric layer and forming filling the remainder of the elongated aperture a gate electrode; removing the pair of second sacrificial layers and the pair of sacrificial sidewall spacer layers; and implanting a pair of lightly doped extension regions into the semiconductor substrate while employing the gate electrode as a mask.