Patent ID: 7652326

Claim:
A semiconductor device comprising: a drift region of a first conductivity type; a well region extending above the drift region and having a second conductivity type opposite the first conductivity type; an active trench extending into the drift region deeper than the well region, and having its sidewalls and bottom lined with dielectric material and substantially filled with a gate conductive layer; source regions having the first conductivity type formed in the well region adjacent the active trench; a body trench extending deeper than the well region and formed adjacent the well and it's source region, the body trench being substantially filled with conductive material; and a layer of second concentration of the second conductivity type substantially surrounding the body trench; wherein the active trench further includes a first shield electrode made of conductive material formed under the gate conductive layer, the shield electrode being insulated from the gate conductive layer and the trench sidewalls and bottom by a layer of dielectric material.