Patent ID: 6987305
Filing Date: 2006-01-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a die having formed therein a semiconductor switching device and a schottky device, said semiconductor switching device including a plurality of gate trenches each including a pair of opposing sidewalls and a bottom wall and each extending from a top surface of said die to a drift region in the body of said die, channel regions of a first conductivity type formed in said die and disposed adjacent the sidewalls of said gate trenches, a gate insulation layer disposed on each sidewall of a gate trench adjacent a respective channel region, conductive gate material contained within said gate trenches and insulated from said channel regions by said gate insulation layers, and regions of a second conductivity type opposite to the conductivity type of said channel region each disposed at a sidewall of a respective gate trench and each extending from the top surface of said die to a respective channel region; said schottky device including a schottky barrier disposed over and in schottky contact with a portion of the top surface of said die; a first contact in contact with said schottky barrier and said regions of said second conductivity type; and a termination structure, said termination structure being comprised of a depression formed in said die to a depth below that of said channel region, a first insulation layer formed over major surfaces of said depression, a conductive layer formed over said insulation layer, a second insulation layer formed over said conductive layer, and a termination contact formed over said second insulation layer, wherein said termination contact is in electrical contact with said conductive layer through said second insulation layer.