Patent ID: 7671441
Filing Date: 2010-03-02
Classification: H01L

Abstract:
1. A power semiconductor device, comprising: a semiconductor body of a first conductivity type; at least one gate trench along a surface of said semiconductor body, said gate trench having sidewalls and a bottom surface; a gate insulation layer lining at least portions of the sidewalls and the bottom surface of said gate trench; an insulation body disposed within said gate trench adjacent said bottom surface thereof; a gate electrode disposed between respective opposing sides of said insulation body and a respective sidewall of said gate trench, wherein each said gate electrode includes an outer surface facing said insulation body and interior of said gate trench, said outer surface including a top portion that curves downwardly toward the bottom of said gate trench and each said gate electrode including a silicide layer along an outer surface thereof; each said silicide layer extending from the bottom surface of said gate trench towards an upper end of said gate trench; a channel region of a second conductivity type in said semiconductor body, wherein said gate trench extends through said channel region; and a tip implant of said first conductivity type formed within said semiconductor body at the bottom of said gate trench; wherein said tip implant at the bottom of said gate trench is disposed directly below said insulation body within said gate trench and extends below said gate electrodes, wherein said gate insulation layer is disposed between said insulation body and said tip implant at the bottom of said gate trench.