Patent ID: 11963349
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for forming a three-dimensional (3D) memory device, comprising:
sequentially forming a sacrificial layer on a substrate, a first stop layer on the sacrificial layer, an N-type doped semiconductor layer on the first stop layer, and a dielectric stack on the N-type doped semiconductor layer;
forming a plurality of channel structures each extending vertically through the dielectric stack and the N-type doped semiconductor layer, stopping at the first stop layer;
replacing the dielectric stack with a memory stack, such that each of the plurality of channel structures extends vertically through the memory stack and the N-type doped semiconductor layer;
sequentially removing the substrate, the sacrificial layer, and the first stop layer to expose ends of the plurality of channel structures; and
forming a conductive layer in contact with the ends of the plurality of channel structures.