Patent ID: 7667264

Claim:
A semiconductor device comprising: a drain; a body in contact with the drain, the body having a body top surface; a plurality of source regions embedded in the body, extending downward from the body top surface into the body; a trench extending through the plurality of source regions and the body to the drain, said trench having a trench opening and a trench wall; and a gate disposed in the trench, said gate having a gate top surface that extends substantially above the body top surface at least in the center region of the trench opening, and said gate having a vertical edge that includes an extended portion extending above the trench opening, the extended portion being substantially aligned with the trench wall; and a plurality of spacers insulating the source from the gate, each of the plurality of spacers being situated immediately adjacent to the gate and immediately adjacent to a respective one of the plurality of source regions, wherein each of the plurality of spacers does not substantially extend into the trench and does not substantially extend over the trench; a dielectric layer disposed over the source, the spacers, the gate, and at least a portion of the body, the dielectric layer forming a contact opening that has a width that is narrower than a distance between edges of the source regions; and a metal layer disposed over the dielectric layer, making a contact with the body at the contact opening.