Patent ID: 6175143
Filing Date: 2001-01-16
Classification: H01L,Y10S

Abstract:
A diode comprising:a first-conductivity-type first region having a first impurity concentration;a first-conductivity-type second region placed on said first region and having a second impurity concentration that is lower than said first impurity concentration, said first region and said second region constituting a semiconductor substrate;a generally ring-like second-conductivity-type third region formed in a surface layer of said second region;a first main electrode formed in contact with said first region;a third main electrode which contacts with a surface of said semiconductor substrate located inside said third region, so as to form a Schottky junction; anda first-conductivity-type fifth region formed in a surface layer of said second region located inside said second-conductivity-type third region, said fifth region having a resistivity that is higher than that of said second region, and having a thickness in a range of 0.01 to 0.5 .mu.m that is smaller than a diffusion depth of said third region.