Patent ID: 7629616

Claim:
A MOSFET comprising: a first layer having opposite first and second surfaces, and a trench extending from the first surface into the first layer, the first layer having a first conductivity type; a first epitaxial layer within the trench on sidewalls and a bottom of the trench, the first epitaxial layer having a second conductivity type opposite the first conductivity type; a second epitaxial layer within the trench on the first epitaxial layer, the second epitaxial layer having the first conductivity type; at least two oxide spacers on the second epitaxial layer; a source contact between the oxide spacers and in contact with the first and second epitaxial layers; a gate oxide layer on the first surface of the first layer, and on a surface of the first epitaxial layer that is over the trench that is not between the oxide spacers; a gate electrode on the gate oxide layer over the surface of the first epitaxial layer; and a drain electrode over the second surface of the first layer.