Patent ID: 8368140
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor region of a first conductivity type and a first conductivity concentration; a first trench including a metal layer in contact with said first semiconductor region to form a metal-semiconductor junction; a second semiconductor region adjacent to said first semiconductor region and the metal-semiconductor junction, the second semiconductor region having a second conductivity type and a second conductivity concentration, wherein said second semiconductor region forms a PN junction with said first semiconductor region; and a third semiconductor region of said second semiconductor type and said second semiconductor concentration that is adjacent to said second semiconductor region and said metal layer and extends below a portion of a bottom of said first trench, wherein said third semiconductor region extends said PN junction to form an extended PN junction portion, and wherein said PN junction curves upward at a first angle toward the first trench, said extended PN junction portion curves upward at a second angle to the first trench, and said second angle is different from said first angle.