Patent ID: 8432000
Filing Date: 2013-04-30
Classification: H01L

Abstract:
1. A semiconductor device comprising: an epitaxial layer; a field oxide disposed in the epitaxial layer, the field oxide extending into the epitaxial layer; a first trench having a sidewall and disposed in the epitaxial layer; a second trench having a sidewall and disposed in the epitaxial layer; a mesa disposed between the first trench and the second trench, the mesa having a top surface substantially coplanar with a top surface of the field oxide; a shield dielectric having a first portion lining the sidewall of the first trench and having a second portion covering at least a portion of the top surface of the field oxide; a polysilicon disposed in the first trench; and a substantially planar surface including the top surface of the polysilicon, a bottom surface of the second portion of the shield dielectric, and the top surface of the mesa.