Patent ID: 11894258
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. The manufacturing method according to claim 8, further comprising:
providing an accumulation region of the first conductivity type that has a higher doping concentration than a doping concentration of the drift region, wherein
a lower end of the accumulation region is deeper than half a depth position of an adjacent trench portion of the plurality of trench portions, and has a depth which is the same as or shallower than a depth of a boundary between a sidewall region where the trench portion extends toward a rear surface of the semiconductor substrate, and a bottom region where a width of the trench portion decreases toward a bottom portion of the trench portion,
a depth of a lower end of the first anode region is deeper than half a depth of a lower end of the second anode region, and
the depth of the lower end of the second anode region is smaller than a thickness from an upper end to the lower end of the accumulation region.