Patent ID: 11915976
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A system, comprising:
one or more tools configured to:
provide a first amount of an ammonia gas and a second amount of a nitrogen trifluoride gas in a processing chamber to cause a reaction, between the ammonia gas and the nitrogen trifluoride gas, that forms an ammonium fluoride gas at a rate satisfying a threshold rate;
form, based on the ammonium fluoride gas being formed at the rate, a protection layer above an insulating cap, a dielectric layer, and a source or drain region of a semiconductor device to protect the source or drain region from being etched by fluorine ions resulting from the reaction between the ammonia gas and the nitrogen trifluoride gas;
clean an oxide layer from the insulating cap, the dielectric layer, and the source or drain region; and
heat, after cleaning the oxide layer from the insulating cap, the dielectric layer, and the source or drain region, the semiconductor device to remove the protection layer from the source or drain region.