Patent ID: 6770548
Filing Date: 2004-08-03
Classification: H01L

Abstract:
A method of forming a trench Schottky rectifier, comprising:forming a semiconductor region having first and second opposing faces, said semiconductor region comprising a cathode region of a first conductivity type adjacent the first face and a drift region of said first conductivity type adjacent the second face, said drift region having a lower net doping concentration than that of said cathode region; forming one or more trenches extending from said second face into said semiconductor region, said trenches defining one or more mesas within said semiconductor region; forming an insulating region adjacent said semiconductor region in said trench by thermally growing a first insulating layer contacting said semiconductor region and depositing a second insulating layer over said first thermally grown insulating layer; and forming an anode electrode that is (a) adjacent to and forms a Schottky rectifying contact with said semiconductor region at said second face, and (b) adjacent to said insulating region in said trench.