Patent ID: 7696598
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. A rectifier device comprising: a substrate of a first polarity; a lightly doped layer of said first polarity coupled to the first surface of said substrate; a metallization layer disposed on said lightly doped layer as an anode of the rectifier device; a metal contact disposed on the substrate as a cathode of the rectifier device; a plurality of trenches recessed vertically into said lightly doped layer, wherein each of said plurality of trenches is filled with a conductive material; a plurality of wells, separated from one another, formed beneath and adjacent to said plurality of trenches, comprising doping of a second polarity, wherein said plurality of wells are electrically coupled to said metallization layer via said conductive material in said plurality of trenches; and a plurality of JFET channel regions, separated from said metallization layer by at least a portion of said lightly doped layer and located between wells of said plurality of wells, more highly doped of said first polarity than said lightly doped layer, wherein the plurality of JFET channel regions have approximately the same vertical dimension as the plurality of wells and the plurality of JFET channel regions are configured to form a plurality of vertical current flow channels between the metallization layer and the substrate.