Patent ID: 6855986
Filing Date: 2005-02-15
Classification: H01L

Abstract:
1. A termination structure provided for a trench DMOS device, comprising: a substrate of a first type conductivity; an epitaxial layer of said first type conductivity over said substrate, said epitaxial layer having a lower doping concentration than said substrate; a body region of a second type conductivity within said epitaxial layer; a trench through said body region between an active area and an edge of said substrate; a gate oxide layer lining said trench and extending to an upper surface of said body region between said trench and said active area; a passivation layer formed on said gate oxide layer, including sidewalls and a bottom surface of said trench; and a metal layer covering portions of said passivation layer on the side walls of said trench to expose a part of said passivation layer over the bottom surface of said trench.