Termination for trench field plate power mosfet

Abstract

A semiconductor device includes a substrate having opposed first and second major surface, an active area, and a termination area. Insulated trenches extend from the first major surface toward the second major surface, each of the insulated trenches including a conductive field plate and a gate electrode overlying the conductive field plate, the gate electrode being separated from the field plate by a gate-field plate insulator. The field plate extends longitudinally in both of the active and termination areas and the gate electrode is absent in the termination area. A body region of a first conductivity type extends laterally between pairs of the insulated trenches. First and second spacer regions of a second conductivity type extend laterally between the pairs of the insulated trenches at the termination area to produce segments of the first conductivity type between the first and second spacer regions that are isolated from the body region.