Patent ID: 9035434
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first electrode; a first layer located on said first electrode and having a first conductivity type; a second layer located on said first layer and having a second conductivity type different from said first conductivity type; a third layer located on said second layer; a second electrode located on said third layer; and a fourth layer located between said second layer and said third layer, and having said second conductivity type, said third layer including an area of said second portion accounting for not less than 20% and not more than 95% of a total area of said first and second portions, said fourth layer including wherein: a surface of the first portion facing the fourth layer is flush with a surface of the second portion facing the fourth layer, the third portion of said fourth layer has a peak value of impurity concentration at a position spaced apart from a surface of the third portion that faces the third layer, the fourth portion of said fourth layer has a peak value of impurity concentration at a position spaced apart from a surface of the fourth portion that faces the third layer, and the peak value of impurity concentration in said third portion of said fourth layer is higher than the peak value of impurity concentration in said fourth portion of said fourth layer.