Patent ID: 11935945
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A manufacturing method of a semiconductor device, comprising:
a preparation step configured to prepare a P-type semiconductor substrate; and
a first inverting step configured to form an N-type region including a center position in a depth direction of the P-type semiconductor substrate, by implanting a donor into the P-type semiconductor substrate and performing heat treatment, wherein
in the first inverting step,
a hydrogen ion is implanted into the P-type semiconductor substrate; and
heat treatment is performed on the P-type semiconductor substrate to form the N-type region, in a state where no other hydrogen ion is implanted over a range of 40% or more of a thickness of the P-type semiconductor substrate in a direction toward the center position of the P-type semiconductor substrate from a position where the hydrogen ion has been implanted.