Patent ID: 9590075
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor drain layer of a first conductivity type; a semiconductor drift layer of a second conductivity type overlying the semiconductor layer of the first conductivity type; a second-conductivity-type body layer overlying the semiconductor layer of the second conductivity type; a plurality of trenches extending into the semiconductor body and drift layers, wherein each of the plurality of trenches comprises a first dielectric material disposed therein, the first dielectric material including an intentionally introduced fixed charge; a plurality of control gates coupled to the body layer to control conduction therethrough; and a plurality of first-conductivity-type source regions coupled to the semiconductor body layer of the second conductivity type; wherein said intentionally introduced fixed charge at least partially balances the net charge in depleted portions of the semiconductor drift layer in the OFF state.