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

Claim 0:
1. A semiconductor device comprising:
a semiconductor substrate having a transistor section and a diode section, wherein
both the transistor section and the diode section each have:
a drift region of a first conductivity-type provided inside the semiconductor substrate, and
a base region of a second conductivity-type provided above the drift region inside the semiconductor substrate,
inside the semiconductor substrate, a lifetime control region including lifetime killers is provided below the base region from at least a part of the transistor section to the diode section, and
in the transistor section, a threshold value adjusting section for adjusting a threshold value of the transistor section is provided overlapping the lifetime control region as seen from an upper surface of the semiconductor substrate, the threshold value adjusting section includes a thickened portion Wgi of a gate insulating film in a gate trench section adjacent to the base region, the thickened portion having a dielectric constant less than or equal to 0.9 times a remaining portion of the gate insulating film in the gate trench section.