Patent ID: 9627526
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. A semiconductor device formed on a semiconductor substrate comprising: an active area including a plurality of transistors each of which has source, body, drain and gate regions; and a termination area surrounding said active area, said termination area including at least an innermost termination trench adjacent to the active area and an outermost termination trench spaced apart from the innermost termination trench, each having electrically conductive material disposed therein and electrically insulative material disposed between said electrically conductive material and material of said substrate, the innermost termination trench having a gate portion formed by said electrically conductive material having a cross-sectional area of said gate portion smaller than a cross-sectional area of said gate region of the transistor in said active area, said gate portion in superimposition with, and insulated from, a shielding gate region formed of said conductive material at a lower portion of said innermost termination trench adjacent the active area, with said source region and said shielding gate region being electrically connected, with a top surface of said substrate material in the termination area being recessed at least to a bottom of said gate portion and said electrically conductive material disposed in said outermost termination trench spaced-apart from said innermost termination trench being electrically connected to a substrate region within the termination area.