Patent ID: 11961719
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A vacuum processing method for etching a titanium-containing film in a processing chamber, the vacuum processing method comprising:
a step of etching the film; and
a step of cleaning an inside of the processing chamber by using a mixed gas of nitrogen trifluoride (NF) gas, argon (Ar) gas, chlorine (Cl) gas, and (N2) gas,
wherein said step of cleaning further comprises setting a flow rate ratio of the nitrogen (N2) gas to the mixed gas of the nitrogen trifluoride (NF3) gas, the argon (Ar) gas, and the chlorine (Cl2) gas to be between 0% and 30% to provide a maximum cleaning effect of a titanium-based reaction product.