Patent ID: 6849898
Filing Date: 2005-02-01
Classification: H01L

Abstract:
1. A metal-insulator-semiconductor device, comprising: a semiconductor substrate including a trench extending into said substrate from a surface of said substrate; a source region of a first conductivity type adjacent to a sidewall of said trench and to said surface; a body region of a second conductivity type opposite to said first conductivity type adjacent to said source region and to said sidewall and to a first portion of a bottom surface of said trench; and a drain region of said first conductivity type adjacent to said body region and to a second portion of said bottom surface of said trench, wherein said trench is lined with a first insulative layer at least along said sidewall that abuts said body region and at least along said first portion of said bottom surface that abuts said body region, and wherein said trench is lined with a second insulative layer at least along said second portion of said bottom surface of said trench, said second insulative layer being coupled to said first insulative layer and said second insulative layer being thicker than said first insulative layer.