Patent ID: 8853770

Claim:
A termination structure for a power transistor, said termination structure comprising: a semiconductor substrate having an active region and a termination region, the substrate having a first type of conductivity; a termination trench located in the termination region and extending from a boundary of the active region toward an edge of the semiconductor substrate; a doped region having a second type of conductivity disposed in the substrate below the termination trench; a MOS gate formed on a sidewall adjacent the boundary, wherein the doped region extends from below a portion of the MOS gate toward the edge of the semiconductor substrate; a termination structure oxide layer formed on the termination trench covering a portion of the MOS gate and extending toward the edge of the substrate, the termination structure oxide layer and the doped region being in contact with one another and defining an interface therebetween; a first conductive layer formed on a backside surface of the semiconductor substrate; and a second conductive layer formed atop the active region, an exposed portion of the MOS gate, and extending to cover a portion of the termination structure oxide layer.