Patent ID: 9054152
Filing Date: 2015-06-09
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 on the first semiconductor region; a third semiconductor region of the first conductivity type on the second semiconductor region; a control electrode disposed within the first and second semiconductor regions; an insulating film between the control electrode and the first and second semiconductor regions; a first electrode electrically connected with the second semiconductor region and the third semiconductor region; a second electrode; and a fourth semiconductor region of the second conductivity type between the second electrode and the first semiconductor region and electrically connected with the second electrode, the fourth semiconductor region including a first portion having a first dopant concentration and a second portion having a second dopant concentration higher than the first dopant concentration, wherein an area of contact of the first portion with the second electrode is larger than an area of contact of the second area with the second electrode.