Patent ID: 11908912
Assignee: TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A semiconductor device, comprising:
a first electrode;
a first semiconductor layer located on the first electrode, the first semiconductor layer being of a first conductivity type;
a first insulating film extending downward from an upper surface of the first semiconductor layer;
a second semiconductor layer partially provided in an upper layer portion of the first semiconductor layer, the second semiconductor layer being next to the first insulating film with the first semiconductor layer interposed, the second semiconductor layer being of a second conductivity type;
a third semiconductor layer partially provided in an upper layer portion of the second semiconductor layer, the third semiconductor layer being of the first conductivity type;
a second electrode extending in a vertical direction, the second electrode including
a first portion, the first portion including an upper end portion, the first portion including a lower end portion that is located in the first insulating film, and
a second portion linked to the upper end portion of the first portion, the second portion overlapping a portion of the first semiconductor layer and a portion of the second semiconductor layer when projected onto the plane;

a third electrode located higher than an upper end of the second portion, the third electrode being electrically connected to the third semiconductor layer; and
a second insulating film located between the second portion and the third electrode, between the second portion and the first semiconductor layer, and between the second portion and the second semiconductor layer, wherein
the first semiconductor layer is in direct contact with the first insulating film and the second insulating film.