Patent ID: 6998315
Filing Date: 2006-02-14
Classification: H01L

Abstract:
1. A method of simultaneously forming a trench DMOS device and a termination structure provided therefor, comprising: forming an epitaxial layer of a first type conductivity on a substrate of said first type conductivity, said epitaxial layer having a lower doping concentration that said substrate; forming a body region of a second type conductivity within said epitaxial layer; forming a plurality of first type trenches and a second type trench through said body region, said second type trench having a greater width than said first type trenches; growing a gate oxide layer for covering said body region and lining said first type trenches and said second type trench; filling said first type trenches with gate electrodes; forming a plurality of doped regions of said first type conductivity within said body region between said first type trenches; forming a passivation layer on said gate oxide layer and covering said gate electrodes; forming a plurality of contact holes between said first type trenches; forming a plurality of contact regions of a second type conductivity within exposed portions of said body region in said contact holes; forming a metal layer on said passivation layer and filling said contact holes and said second type trench; and forming an opening through said metal layer to expose a part of said passivation layer over a bottom surface of said second type trench, and portions of said passivation layer on side walls of said second type trench being covered by said metal layer.