Patent ID: 11882698
Assignee: KIOXIA CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor memory device comprising:
a first insulating layer;
a plurality of bit lines extending in a first direction and arranged in a second direction intersecting the first direction, the plurality of bit lines including a first bit line and a second bit line adjacent to the first bit line in the second direction;
a contact plug coupled to a first surface of the first bit line in a third direction intersecting the first and second directions, wherein
the first bit line includes a first portion overlapping the contact plug in the third direction and a second portion not overlapping the contact plug in the third direction,
the second bit line includes a third portion overlapping the contact plug in the third direction and a fourth portion not overlapping the contact plug in the third direction,
a thickness in the third direction of the first portion is smaller than a thickness in the third direction of the second portion in the first bit line,
a thickness in the third direction of the third portion is smaller than a thickness in the third direction of the fourth portion in the second bit line,
a third bit line provided in the first insulating layer, extending in the first direction, and provided adjacent to the second bit line on a side opposite to the first bit line with respect to the second bit line in the second direction,
wherein the thicknesses in the third direction of the first portion and the third portion are smaller than the thickness in the third direction of the third bit line,
a fourth bit line provided in the first insulating layer, extending in the first direction, and provided on a side opposite to the second bit line with respect to the first bit line in the second direction, and
wherein a thickness in the third direction of a portion of the fourth bit line that overlaps the contact plug in the third direction is smaller than thicknesses in the third direction of the second portion and the fourth portion.