Patent ID: 6558984
Filing Date: 2003-05-06
Classification: H01L

Abstract:
A method of forming a trench Schottky barrier rectifier, comprising:forming 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; forming 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 trench intersections at a plurality of locations; forming an oxide layer, said oxide layer covering said semiconductor region at locations corresponding to trench bottoms and lower portions of trench sidewalls; forming a polysilicon region, said polysilicon region being disposed within said trenches over said oxide layer; forming insulating regions over said oxide layer at said trench intersections; and forming an anode electrode that is adjacent to and forms a Schottky rectifying contact with said drift region.