Patent ID: 11925019
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for forming a three-dimensional (3D) memory device, comprising:
forming a stack structure above a substrate, the stack structure comprising first layers and second layers interleaving the first layers;
forming an opening extending through the stack structure along a vertical direction;
removing parts of the second layers facing the opening to form a plurality of recesses;
forming a plurality of blocking structures along sidewalls of the recesses; and
forming a plurality of storage structures over the blocking structures, respectively, comprising:
forming a storage layer along sidewalls of the opening, top and bottom surfaces of the recesses, and the sidewalls of the recesses over the blocking structures; and
removing part of the storage layer,

wherein a vertical dimension of each of the blocking structures is nominally the same as a vertical dimension of a respective one of the storage structures over the blocking structure.