Patent ID: 6977208
Filing Date: 2005-12-20
Classification: H01L

Abstract:
1. A schottky device comprising; a semiconductive substrate of a first conductivity type and a first concentration of dopants; a semiconductive layer of said first conductivity type and a second concentration of dopants, said first concentration of dopants being higher than said second concentration of dopants; a plurality of trenches extending to a depth inside said semiconductive layer, each of said trenches including opposing sidewalls and a bottom, and each being adjacent at least one mesa, each mesa being of said first conductivity only; a first insulation layer of a first thickness on each sidewall of each of said trenches; a second insulation layer of a second thickness on said bottom of each of said trenches, said second thickness being greater than said first thickness, said second insulation layer terminating at and extending along said bottom of each said trenches only, and said first insulation extending along the remainder of said sidewall; an electrode disposed in each of said trenches; a termination trench of the same depth as said plurality of trenches surrounding said plurality of said trenches, said termination trench including a bottom portion, and an inner sidewall, said inner sidewall being a sidewall of a mesa of only said first conductivity; an insulation layer of a same thickness as a first insulation layer disposed on at least said inner sidewall of said termination trench, an electrode on said insulation layer disposed on at least said inner sidewall, and an insulation layer disposed on said bottom portion of said termination trench, said insulation layer on said bottom portion being thicker than said insulation layer on said inner sidewall of said trench; a schottky barrier in schottky contact with said mesas; a first electrical contact in contact with said schottky barrier, said electrodes in said trenches, and a surface of said electrode on said insulation layer opposite said inner sidewall of said termination trench; and a second electrical contact in electrical contact with said semiconductive substrate.