Patent ID: 11862472
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC H  B  C | IPC B  C  H

Claim 12:
13. A method for forming a three-dimensional (3D) memory device, comprising:
depositing a dielectric layer over a peripheral region, a core array region, and a staircase region between the peripheral region and the core array region;
removing, using an etch mask, a part of the dielectric layer over the core array region to form an offset of the dielectric layer between the staircase region and the core array region;
applying an auto-stop slurry directly onto a top surface of the dielectric layer, wherein the auto-stop slurry comprises a ceria-based abrasive; and
applying a down force to the auto-stop slurry directly on the top surface of the dielectric layer to polish the dielectric layer.