Patent ID: 11881504
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device comprising:
a silicon substrate of a first conductivity type including a cell part and a termination part surrounding the cell part in plan view;
an emitter layer of the first conductivity type provided on a front surface of the silicon substrate in the cell part;
a collector layer of a second conductivity type provided on a back surface of the silicon substrate in the cell part;
a drift layer of the first conductivity type provided between the emitter layer and the collector layer;
a trench gate provided to reach the drift layer from a front surface of the emitter layer; and
a well layer of the second conductivity type provided on the front surface of the silicon substrate in the termination part, wherein
vacancies included in a crystal defect in the cell part are less than vacancies included in a crystal defect in the termination part.