Patent ID: 7064408
Filing Date: 2006-06-20
Classification: H01L

Abstract:
1. A power rectifier device, comprising: an n−drift layer formed on an n+ substrate; a cathode metal layer formed on a surface of said n+ substrate opposite said n−drift layer; a pair of field oxide regions formed into said n−drift layer, and said field oxide regions separated by a first mesa; a pair of termination regions spaced, respectively, said pair of field oxide regions with a second mesa; said first mesa and said second mesa having trenches formed into said n−drift layer; four p-type doped regions, respectively, right beneath each of said termination regions and said field oxide regions; a barrier metal layer formed on sidewalls and bottom of said trenches, and formed on remnant portions of said first mesa and said second mesa; and a top metal layer acted as an anode electrode formed on said barrier metal layer, said field oxide regions and extended to cover a portion of said termination regions.