Patent ID: 11901313
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method for forming a three-dimensional (3D) memory device, comprising:
forming a first block layer, a sacrificial layer, and a second block layer on a first semiconductor layer;
forming a block plug extending through the second block layer, the sacrificial layer, and the first block layer in contact with the first semiconductor layer, wherein the block plug divides the second block layer, the sacrificial layer, and the first block layer into a first portion and a second portion;
forming a dielectric stack comprising interleaved stack sacrificial layers and stack dielectric layers over the second block layer;
forming an opening extending through the dielectric stack and the first portion of the second block layer to expose the first portion of the sacrificial layer; and
replacing the first portion of the sacrificial layer with a second semiconductor layer through the opening.