Patent ID: 6313482
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A silicon carbide Schottky rectifier, comprising:a silicon carbide substrate having a uniformly doped silicon carbide drift region of first conductivity type therein;first and second trenches having widths W.sub.T1, and W.sub.T2, respectively, in said uniformly doped silicon carbide drift region, said first and second trenches defining a silicon carbide drift region mesa therebetween having a width W.sub.M and a first conductivity type doping concentration N.sub.DM therein;first and second uniformly doped silicon carbide charge coupling regions of second conductivity type in said first and second trenches, respectively, said first uniformly doped silicon carbide charge coupling region forming a first P-N rectifying junction with said silicon carbide drift region mesa along a sidewall of said first trench and said second uniformly doped silicon carbide charge coupling region forming a second P-N rectifying function with said silicon carbide drift region mesa along a sidewall of said second trench; anda Schottky rectifying contact on said silicon carbide drift region mesa;wherein the second conductivity type doping concentrations in said first and second silicon carbide charge coupling regions equal N.sub.CC1 and N.sub.CC2, respectively;wherein 0.5.times.10.sup.13 cm.sup.-2.ltoreq.(N.sub.DM)(W.sub.M).ltoreq.5.0.times.10.sup.13 cm.sup.-2 ; and wherein (N.sub.DM)(W.sub.M)=1/2(N.sub.CC1)(W.sub.T1)+1/2(N.sub.CC2)(W.sub.T2).