Patent ID: 11923444
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device comprising:
a drift region of a first conductivity type;
a first semiconductor region of the first conductivity type provided above the drift region and having a doping concentration higher than the drift region;
a second semiconductor region of a second conductivity type provided between the first semiconductor region and the drift region; and
a plurality of trench portions arranged in a first direction and having an extending portion that extends in a second direction perpendicular to the first direction, wherein
at least one trench portion of the plurality of trench portions has a first tapered portion at an upper side than a depth position of a lower surface of the second semiconductor region, a width of the first tapered portion in the first direction becoming smaller from a lower side of the first tapered portion toward an upper side of the first tapered portion.