Patent ID: 11877448
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 14:
15. A method for forming a three-dimensional (3D) memory device, comprising:
sequentially forming a sacrificial layer on a substrate, a first conductive layer on the sacrificial layer, a P-type doped semiconductor layer having an N-well on the first conductive layer, and a dielectric stack on the P-type doped semiconductor layer;
forming a plurality of channel structures each extending vertically through the dielectric stack and the P-type doped semiconductor layer, stopping at the first conductive 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 P-type doped semiconductor layer;
sequentially removing the substrate, the sacrificial layer, and part the first conductive layer to expose an end of each of the plurality of channel structures; and
forming a second conductive layer in contact with the ends of the plurality of channel structures and the first conductive layer.