Patent ID: 8686436
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor region including silicon carbide of a first conductivity type, the first semiconductor region having a first portion; a second semiconductor region provided adjacent to the first portion on the first semiconductor region, the second semiconductor region including silicon carbide of a second conductivity type; a third semiconductor region provided spaced from the first portion on the second semiconductor region, the third semiconductor region including silicon carbide of the first conductivity type; a fourth semiconductor region provided on the second semiconductor region, the fourth semiconductor region including silicon carbide of the second conductivity type; an insulating film provided on the first semiconductor region, the second semiconductor region and the third semiconductor region; a control electrode provided on the insulating film; a first electrode electrically connected to the third semiconductor region; and a second electrode electrically connected to the first semiconductor region, the second semiconductor region having a first region and a second region, the first region contacting with the third semiconductor region and the fourth semiconductor region, the second region contacting with the first portion, an impurity concentration of the first region being higher than an impurity concentration of the second region, wherein the third semiconductor region includes a high resistance region and a low resistance region, the low resistance region having a lower resistance value than the high resistance region.