Patent ID: 11911809
Assignee: SHANGHAI HUALI MICROELECTRONICS CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  H  Y | IPC B  H

Claim 4:
5. The preventive maintenance method for the chamber of the metal etching machine according to claim 1, wherein step S3 comprises the following steps:
S31: injecting NF3, Cl2, and SF6 into the chamber from the gas inlet, an NF3 injection flow rate is greater than a second flow rate, a Cl2 injection flow rate is greater than a third flow rate, and an SF6 injection flow rate is smaller than a fourth flow rate, making the pressure inside the chamber lower than the set first pressure, to clean the electrostatic chuck by a burning reaction between the NF3/Cl2 and the metal particles, wherein the second flow rate is greater than the third flow rate, the third flow rate is greater than the fourth flow rate; and
S32: keeping flow rates of NF3, Cl2, and SF6 injected from the gas inlet into the chamber unchanged, simultaneously injecting O2 and H2 into the chamber from the gas inlet, the O2 injection flow rate is smaller than a fifth flow rate, an H2 injection flow rate is smaller than a sixth flow rate, the internal pressure of the chamber is higher than the set second pressure, to clean the electrostatic chuck by the burning reaction between the NF3/Cl2 and the metal particles, the second flow rate is greater than the fifth flow rate, and the fifth flow rate is greater than the sixth flow rate.