Patent ID: 9614043
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a termination trench formed in a substrate, said termination trench comprises: a core trench formed in said substrate, said core trench comprises: a mesa of said substrate located between said core trench and said termination trench, a surface of said termination trench is a first surface of said mesa and a surface of said core trench is a second surface of said mesa; and a third oxide located above said mesa and directly contacts said first oxide, said first polysilicon, and said second oxide; said termination trench is wider than said core trench, said termination trench is deeper than said core trench, said first oxide within said termination trench is thicker than said second oxide within said core trench, and said first polysilicon is wider than said second polysilicon.