Patent ID: 11871568
Assignee: SK HYNIX INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. A method of manufacturing a semiconductor device, the method comprising:
forming a first stack structure by alternately stacking first and second material layers on a source stack structure;
forming a first penetrating portion passing through the first stack structure and the source stack structure; and
forming a second penetrating portion exposing a top surface of the source stack structure by etching the first stack structure from a side portion of the first penetrating portion,
wherein the forming of the second penetrating portion comprises:
forming first grooves by selectively etching the second material layers exposed through a side portion of the first penetrating portion; and
removing the first grooves by selectively etching the first material layers exposed through the side portion of the first penetrating portion.