Patent ID: 11910599
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 9:
10. A memory device, comprising:
a staircase step comprising alternatingly stacked dielectric layers and conductive layers;
a barrier layer disposed on the staircase step and covering a sidewall and a top surface of the staircase step;
a first insulating layer disposed on the barrier layer;
a coaxial contact structure extending through the first insulating layer and the barrier layer and configured to provide electrical connections for the conductive layers of the staircase step, wherein:
the coaxial contact structure comprises an outer conductive ring, an insulating ring and an inner conductive ring, wherein the insulating ring is disposed between the outer conductive ring and the inner conductive ring;
a bottom surface of the outer conductive ring and a bottom surface of the inner conductive ring contact an upper conductive layer and a lower conductive layer of the staircase step, respectively; and
a bottom surface of the insulating ring contacts a corresponding dielectric layer disposed between the upper conductive layer and the lower conductive layer of the staircase step.