Patent ID: 11862558
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. The method of claim 13, wherein the performing the second patterning process comprises:
performing the second patterning process repetitively on the sacrificial word line layers and the insulating layers in the second staircase region to form stairs having treads with the first edge profile in the third section and extending in the fourth step-down direction (X direction), and stairs having treads with the first edge profile in the fourth section and extending in the first step-down direction (−X direction); and
performing the second patterning process repetitively on the sacrificial word line layers and the insulating layers in the second staircase region to form stairs having treads with the second edge profile in the third section and extending in the fourth step-down direction (X direction), and stairs having treads with the second edge profile in the fourth section and extending in the first step-down direction (−X direction), the first edge profile and the second edge profile being symmetric.