Patent ID: 11948889
Assignee: KIOXIA CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A semiconductor memory device comprising:
a stacked body that includes a plurality of conductive layers stacked via a first insulating layer, and includes, at each of opposite ends in a first direction, a first staircase part in which the plurality of conductive layers are terminated stepwise;
a pillar that extends in the stacked body in a stacking direction of the stacked body, and form memory cells at positions intersecting with at least some conductive layers of the plurality of conductive layers;
a strip part that divides the stacked body in the first direction by extending in a second direction crossing the first direction;
a plurality of first contacts that are arranged in the first staircase part, in which each of the first contacts is connected to one of the plurality of conductive layers at each step of the first staircase part;
a second contact that is arranged on a strip part side of the stacked body and is connected to an uppermost conductive layer of the plurality of conductive layers arranged in contact with the strip part;
a second insulating layer that contacts with the some conductive layers;
a shallow groove that extends in the first direction and is filled with an insulating material; and
a fourth contact that divides the stacked body in the second direction by extending in the first direction, wherein
the uppermost conductive layer is divided into a first part and a second part,
the strip part is between the first part and the second part,
at least a part of the strip part is in the second insulating layer,
the second insulating layer contacts with both ends of the first part in the first direction and both ends of the second part in the first direction,
the shallow groove divides some conductive layers positioned as upper layers in the stacked body, which include the uppermost conductive layer, of the plurality of conductive layers included in the stacked body, and
the fourth contact is arranged on each of opposite sides of the shallow groove in the second direction, and is arranged in contact with the strip part.