Patent ID: 11894418
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. The preparation method of the semiconductor structure of claim 18, wherein the step of treating the inner sidewall surface of the hollow cavity to form the uneven structure on the inner sidewall surface of the hollow cavity specifically comprises:
forming a photoresist layer located on the inner sidewall surface of the hollow cavity;
exposing the photoresist layer to light to form an uneven structure on the photoresist layer; and
etching the inner sidewall surface of the hollow cavity to form the uneven structure on the inner sidewall surface of the hollow cavity, wherein the uneven structure on the inner sidewall surface of the hollow cavity is the same as the uneven structure on the photoresist layer.