Patent ID: 9190470
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer; a field insulating film having a first corner portion, the field insulating film provided on the semiconductor layer; a first impurity region of a first conductivity type that is provided in the semiconductor layer, the first impurity region located on an inner side of the field insulating film; a second impurity region of a second conductivity type that is provided on the first impurity region so as to be in contact with the first impurity region, the second impurity region covering the first corner portion provided on the inner side of the field insulating film; a third impurity region of the first conductivity type that is provided in the semiconductor layer, the third impurity region provided on an outer side of the field insulating film; and a fourth impurity region of the first conductivity type that is provided under the semiconductor layer, the fourth impurity region connected to the third impurity region and the first impurity region, a junction between the first impurity region and the second impurity region being a PN junction of a diode, the PN junction being spaced apart from the first corner portion, the second impurity region including a first region that covers the PN junction and a second region that is located on the first region, the second region having a higher impurity concentration than the first region, and the third impurity region including a third region connected to the fourth impurity region and a fourth region that is located on the third region, the fourth region having a higher impurity concentration than the third region.