Patent ID: 11950419
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 12:
13. A three-dimensional (3D) memory device, comprising:
a plurality of contacts aligned in a row in a first direction on a staircase;
a plurality of groups of support structures aligned in a plurality of rows in the first direction; and
a fourth support structure between adjacent groups of support structures, wherein:
the row of the contacts and the plurality of rows of the support structures are apart from one another in a second direction perpendicular to the first direction;
each of the contacts is surrounded by a group of support structures;
the group of support structures comprises three support structures, wherein projections of the three support structures form a triangular shape in a plane parallel to the first direction; and
in the first direction, a distance between the fourth support structure and one of the three support structures in one of the adjacent groups is greater than or equal to 1.5 times a critical dimension of the fourth support structure and less than or equal to 2 times the critical dimension of the fourth support structure.