Patent ID: 8742451

Claim:
A device comprising: a drain electrode; a drift region disposed above the drain electrode; a body region that extends down into the drift region from a first upper semiconductor surface; a source region that extends down into the body region from a second upper semiconductor surface, wherein the first upper semiconductor surface is substantially planar, wherein the second upper semiconductor surface is substantially planar, wherein the first and second upper semiconductor surfaces are not coplanar, wherein a first portion of the body region is disposed at least in part under the source region, wherein the first portion of the body region is surrounded laterally by a second portion of the body region, wherein the second portion of the body region and the drift region meet at a body-to-drift boundary, wherein the body-to-drift boundary has a central portion, wherein the central portion of the body-to-drift boundary is directly beneath the first upper semiconductor surface, and wherein the central portion of the body-to-drift boundary is non-planar; a gate insulator layer disposed over the source region; and a gate electrode disposed over the gate insulator layer.