Patent ID: 11972950
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A semiconductor device comprising:
a semiconductor substrate that has an upper surface and a lower surface,
wherein in a depth direction connecting the upper surface and the lower surface of the semiconductor substrate, a hydrogen concentration distribution has a hydrogen concentration peak located in a range of 5 μm or less from the lower surface in the depth direction, and a helium concentration distribution has a helium concentration peak located, in the depth direction of the semiconductor substrate, on a side of the upper surface than a center of the semiconductor substrate in the depth direction, and
wherein a minimum value of a donor concentration between a depth at which the hydrogen concentration peak is located and a depth at which the helium concentration peak is located is higher than a donor concentration of the semiconductor substrate.