Patent ID: 7449734

Claim:
A junction semiconductor device comprising: a drain region comprising a low-resistance layer of a first conductivity type formed on one surface of a semiconductor crystal, a source region comprising a low-resistance layer of a first conductivity type formed on another surface of said semiconductor crystal, a gate region of a second conductivity type formed on a periphery of said source region, a high-resistance layer of a first conductivity type between said source region and said drain region, a recombination-inhibiting semiconductor layer of a second conductivity type provided in the vicinity of the surface of said semiconductor crystal between said gate region and said source region, so as to provide an increased electric field for one of minority carriers injected from the pate region and majority carriers injected from the source region, and thereby to distance said minority and said majority carriers, respectively, from said surface of said semiconductor crystal, wherein said recombination-inhibiting semiconductor layer has an impurity concentration that is lower than an impurity concentration of said gate region.