Patent ID: 9240456
Filing Date: 2016-01-19
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device comprising: forming on a first main surface of a semiconductor wafer of a first conduction type, each of forming a groove that reaches the first semiconductor region from a second main surface of the semiconductor wafer, the groove being formed so that a portion of the semiconductor wafer, which has a predetermined width greater than zero and forms an entire outer periphery of the semiconductor wafer including an outer circumferential end of the semiconductor wafer, remains and the groove is formed inside the portion of the semiconductor wafer that forms the entire outer periphery of the semiconductor wafer so that the groove is formed further towards a center of the semiconductor wafer than the outer circumferential end; forming a second semiconductor region, that is the second conduction type, in direct contact with the second main surface of the semiconductor wafer; forming a third semiconductor region, that is the second conduction type, in direct contact with a side wall of the groove so as to be electrically connected to both of the first semiconductor region and the second semiconductor region; and forming a second electrode that is electrically connected to the second semiconductor region, wherein in the forming the groove, the groove is formed such that a corner of the groove, which is closest to the outer circumferential end of the semiconductor wafer than any other corner of the groove, has an arc shape in a plan view of the device.