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

Claim 7:
8. The semiconductor device according to claim 1, wherein
the transistor section further has the gate trench section penetrating the base region from the upper surface of the semiconductor substrate to the drift region,
in the transistor section, the base region has a first region that overlaps the lifetime control region and a second region that does not overlap the lifetime control region, as seen from the upper surface of the semiconductor substrate,
the gate trench section includes the gate insulating film provided on an inner wall of the gate trench section,
the gate insulating film includes the threshold value adjusting section provided in contact with the first region, and
a width of the threshold value adjusting section is greater than a width of the gate insulating film in contact with the second region.