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

Claim 19:
20. 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;
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; and
a bottom region of the second conductivity type formed in the first direction from a bottom portion of one trench portion to a bottom portion of an other trench portion, the one trench portion and the other trench portion being adjacent to each other among the plurality of trench portions, wherein
at least one trench portion of the plurality of trench portions has a portion at an upper side than a depth position of a lower surface of the second semiconductor region, a width of the portion in the first direction becoming smaller from a lower side of the portion toward an upper side of the portion.