Patent ID: 9577072
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a semiconductor substrate of a first conductivity type; an expitaxial layer of the first conductivity type disposed on a top surface of the semiconductor substrate, wherein the epitaxial layer includes a surface shielded region that is heavily doped positioned above a voltage blocking region that is lightly doped; an active cell array including a plurality of active semiconductor devices formed in the epitaxial layer; and a termination region surrounding the active cell array, wherein the termination region includes a plurality of termination structures formed in the epitaxial layer, each of the termination structures comprising a trench lined with a dielectric material and filled with a conductive material as a trench shield electrode, and a buried doped-region of the second conductivity type surrounding at least a bottom portion of the trench, and wherein the termination region includes a body region of second conductivity type opposite to the first conductivity type at a top surface of the surface shielded region proximate to the trench shield electrodes, wherein the plurality of termination structures has a first set of one or more termination structures closest to the active cell array, each termination structure in the first set including an electrical connection between its corresponding trench shield electrode and a first portion of the adjacent body layer closer to the active cell array.