Patent ID: 8664714

Claim:
A power MOSFET, having an active area, a gate bus area and a termination area, the power MOSFET comprising: an epitaxy substrate; a plurality of conductive trenches, located in the epitaxy substrate; a plurality of well regions, disposed within the epitaxy substrate; a dielectric layer, disposed on surfaces of the plurality of conductive trenches; and at least one termination structure within the termination area, the termination structure comprising: at least one of the plurality of conductive trenches; the plurality of well regions within the termination area and electrically isolated from each other by the at least one of the conductive trenches; a field plate, disposed on the well regions and on the at least one of the conductive trenches within the termination area, wherein the field plate comprises a plate metal and the dielectric layer; a contact plug, penetrating through the dielectric layer and connecting the plate metal and one of the well regions, so that the plate metal has an equal electric potential with the connected well region through the contact plug, and the well regions and the at least one of the conductive trenches are electrically coupled to the plate metal by the dielectric layer; and a heavily-doped region, disposed between the contact plug and the connected well region.