Patent ID: 11923237
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A manufacturing method of a semiconductor device, comprising:
providing a sacrificial substrate;
forming an etch stop layer on the sacrificial substrate;
oxidizing a portion of the etch stop layer to form an oxide layer between the sacrificial substrate and the remaining etch stop layer;
forming a capping layer on the remaining etch stop layer;
performing a first etching process to remove the sacrificial substrate;
performing a second etching process to remove the oxide layer;
performing a third etching process to remove the remaining etch stop layer, wherein etchants of the first etching process, the second etching process, and the third etching process are different; and
forming a power rail on the capping layer.