Patent ID: 6420768
Filing Date: 2002-07-16
Classification: H01L

Abstract:
A trench Schottky barrier rectifier, comprising:a semiconductor region having first and second opposing faces, said semiconductor region comprising a drift region of first conductivity type adjacent the first face and a cathode region of said first conductivity type adjacent the second face, said drift region having a lower net doping concentration than a net doping concentration of said cathode region; a plurality of trenches extending into said semiconductor region from said first face, said trenches defining a plurality of mesas within said semiconductor region and said trenches forming a plurality of trench intersections; an oxide layer, said oxide layer covering said semiconductor region on bottoms of said trenches and on lower portions of sidewalls of said trenches; a polysilicon region disposed over said oxide layer within said trenches; insulating regions at said trench intersections, said insulating regions covering a portion of said polysilicon region and a portion of said oxide layer at said trench intersections; and an anode electrode that is adjacent to and forms a Schottky rectifying contact with said drift region.