Patent ID: 7696540
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. A rectifier device, comprising a substrate, wherein said substrate is doped with a first dopant type; a first epitaxial layer doped with said first dopant type coupled to said substrate; a first metallization layer adjacent to said first epitaxial layer; a plurality of trenches recessed into said first epitaxial layer, wherein each of said plurality of trenches includes a conductive material coupled to said metallization layer; a plurality of wells each doped with a second dopant type, wherein each of said plurality of wells is separated from one another, and wherein each of said plurality of wells is formed beneath a corresponding trench in said plurality of trenches; a conductive layer disposed between each of the plurality of wells and the corresponding trench; a plurality of oxide layers, each of which is formed on walls and a bottom of a corresponding trench such that a corresponding well is electrically isolated from said conductive material within said corresponding trench; and a plurality of channel regions doped with said first dopant type formed within said first epitaxial layer, wherein each of said plurality of channel regions is located between two corresponding wells from said plurality of wells, and wherein each of said plurality of channel regions is more highly doped with said first dopant type than said first epitaxial layer.