Patent ID: 11915967
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The method for manufacturing the semiconductor device according to claim 6, wherein the forming etching holes in an edge region of the semiconductor substrate, the etching holes penetrating through the etch stop layer comprises:
filling a second sacrificial layer on the etch stop layer in the shallow trench, wherein, an upper surface of the second sacrificial layer is flush with upper surfaces of the active areas;
forming a patterned mask layer above the second sacrificial layer and the active areas, the patterned mask layer is formed with through holes exposing the second sacrificial layer in the edge region of the semiconductor substrate; and
etching, by using the patterned mask layer as a mask, the second sacrificial layer to form the etching holes in communication with the through holes; and
removing the patterned mask layer.