Patent ID: 11903204
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A three-dimensional (3D) memory device, comprising:
a memory stack comprising interleaved conductive layers and dielectric layers;
a channel structure extending vertically through the memory stack;
a channel local contact penetrating a local dielectric layer to contact with the channel structure, the local dielectric layer and a top portion of the channel structure being adjacent;
a slit structure extending vertically through the memory stack and comprising a source contact that comprises a first source contact portion and a second source contact portion above the first source contact portion, the first source contact portion and the second source contact portion comprising different materials; and
a staircase local contact penetrating the local dielectric layer to contact with one of the conductive layers at a staircase structure,
wherein:
an upper end of the channel local contact, an upper end of the second source contact portion, and an upper end of the staircase local contact, and an upper surface of the local dielectric layer are flush with one another.