Patent ID: 8159024
Filing Date: 2012-04-17
Classification: H01L

Abstract:
1. An apparatus comprising: a semiconductor substrate; an epitaxial layer disposed on the semiconductor substrate and configured to provide a drift region; a body portion contacting the drift region and configured to provide a channel for current flow when a bias signal is applied to a gate electrode; a source region contacting the body portion; a gate trench formed in the epitaxial layer; the gate electrode formed at least partially in the gate trench and extending to a first depth in the gate trench; a field plate formed at least partially in the gate trench and extending to a second depth, greater than the first depth, in the gate trench; and a dielectric material comprising a first portion disposed in the gate trench between the gate electrode and the source region and a second portion disposed in the gate trench between the field plate and the epitaxial layer.