Patent ID: 8362547

Claim:
A semiconductor device formed on a semiconductor substrate, comprising: an epitaxial layer overlaying the semiconductor substrate; a drain formed on back of the semiconductor substrate; a drain region that extends into the epitaxial layer; and an active region comprising: a body disposed in the epitaxial layer, having a body top surface; a source embedded in the body, extending from the body top surface into the body; a gate trench extending into the epitaxial layer; a gate disposed in the gate trench; an active region contact trench extending through the source and the body into the drain region; an active region contact electrode disposed within the active region contact trench, wherein the active region contact electrode and the drain region form a Schottky diode; and a Schottky barrier controlling layer that is disposed in the epitaxial layer adjacent to the active region contact trench and that does not extend into the body.