Patent ID: 9142661
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor region of a first conductivity type; a second semiconductor region of a second conductivity type, the second semiconductor region being provided on the first semiconductor region; a third semiconductor region of a first conductivity type, the third semiconductor region being provided on the second semiconductor region; a first electrode having a first portion and a second portion, the first portion having a lower end being positioned below a lower end of the third semiconductor region, the second portion being in contact with the first portion, the second portion being provided on the third semiconductor region; a first contact region provided between the first portion and the second semiconductor region, the first contact region being electrically connected to the first electrode and the second semiconductor region; a second contact region provided between the second portion and the third semiconductor region, the second contact region being electrically connected to the first electrode and the third semiconductor region; and an intermediate layer provided between the first electrode and the first contact region, the intermediate layer having a work function greater than a work function of the first electrode.