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

Claim 7:
8. 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;
a first upper-surface electrode and a second upper-surface electrode provided separately from each other; and
an interlayer insulating film provided below the first upper-surface electrode and the second upper-surface electrode, wherein
each trench portion of the plurality of trench portions includes:
a first trench portion having (i) a first insulating film formed on an inner wall of the first trench portion and (ii) a first conductive portion formed inside of the first insulating film within the first trench portion and connected to the first upper-surface electrode; and
a second trench portion having (i) a second insulating film formed on an inner wall of the second trench portion and (ii) a second conductive portion formed inside of the second insulating film within the second trench portion and connected to the second upper-surface electrode,

the first conductive portion or the second conductive portion 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.