Patent ID: 7078780
Filing Date: 2006-07-18
Classification: H01L

Abstract:
1. A power rectifier device, comprising: an n+ substrate having a n-drift formed thereon; a cathode metal layer formed on a surface of said n+ substrate opposite said n-drift layer; an active region having a metal silicide layer formed thereon; a termination region being defined at positions outer of said active region and having termination trenches formed therein; an insulating layer formed on said n-drift layer and on said termination region; four trenches along a line and filled with an un-doped polycrystalline silicon layer spaced from each other and a second and a third of said trenches formed into said n+ draft layer of said substrate, and a first and a fourth of said trenches formed into said insulating layer and said n− drift layer of said substrate; said active region being defined from a first interval to a second interval, wherein said first interval is in between the first one and the second one of said trenches, and said second interval is in between the third one and the fourth one of said trenches; a thermal oxide layer formed on said termination region; an anode electrode formed on said metal silicide layer and extended to cover the first and the fourth of said trenches, wherein said insulating layer is a stack layer, from said epi-layer sequentially, formed of a first oxide layer, a nitride layer, and a second oxide layer having a thickness between 5 nm to 100 nm, 50 nm to 300 nm, and 0 nm to 1000 nm, respectively.