Patent ID: 8748980

Claim:
A semiconductor device comprising a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) device, wherein the MOSFET device comprises: a drain of a first doping type, wherein the drain comprises a drain contact region and a drift region, and wherein the drift region has a width and a depth; a source of a first doping type; a body of a second doping type, wherein the body is between the drain and the source; a gate above the body, wherein the drain is at one side of the gate and the source is at another side of the gate; and a recessed Field Oxide (recessed-FOX) structure, wherein the recessed-FOX structure is between the gate and the drift region vertically and wherein the recessed-FOX structure is between the body and the drain contact region laterally, and wherein the recessed-FOX structure is configured to make the drift region into a U shape, wherein the depth of the drift region has a positive relationship with the width of the drift region.