Patent ID: 11901419
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. The semiconductor device according to claim 1,
wherein the semiconductor substrate includes:
a drift region of a first conductivity type;
a trench portion provided on the upper surface of the semiconductor substrate; and
a buffer region of the first conductivity type that is provided between the drift region and the lower surface of the semiconductor substrate and has a higher concentration than the drift region,
wherein the first hydrogen concentration peak and the second hydrogen concentration peak are disposed between a lower end of the trench portion and an upper end of the buffer region in the depth direction, and
wherein an intermediate donor concentration between the first hydrogen concentration peak and the second hydrogen concentration peak is lower than any of an upper surface side donor concentration between the first hydrogen concentration peak and the upper surface of the semiconductor substrate and a lower surface side donor concentration between the second hydrogen concentration peak and the lower surface of the semiconductor substrate.