Patent ID: 11901443
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The semiconductor device according to claim 8, wherein
the transistor section further has a dummy trench section that penetrates the base region from the upper surface of the semiconductor substrate to the drift region,
the dummy trench section includes a dummy insulating film provided on an inner wall of the dummy trench section,
the first region is provided in contact with both the gate trench section and the dummy trench section while being sandwiched between the gate trench section and the dummy trench section,
the threshold value adjusting section is provided in contact with the first region on one side of the first region,
the dummy insulating film is provided in contact with the first region on the other side of the first region, and
the width of the threshold value adjusting section is greater than a width of the dummy insulating film.