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

Claim 0:
1. A preventive maintenance method for a chamber of a metal etching machine, wherein the preventive maintenance method for the chamber of the metal etching machine comprises the following steps:
S0: the chamber of the metal etching machine entering a cleaning cycle;
S1: before the chamber of the metal etching machine is opened, cleaning an electrostatic chuck in the chamber and a chamber wall by a burning reaction between O2 and metal particles, wherein step S1 comprises the following steps:
S11: injecting the O2 into the chamber from a gas inlet, wherein an O2 injection flow rate is greater than a set first flow rate and a pressure inside the chamber is lower than a set first pressure, to clean the electrostatic chuck by the burning reaction between the O2 and the metal particles; and
S12: keeping the O2 injection flow rate unchanged, making an internal pressure of the chamber higher than a set second pressure, to clean the electrostatic chuck and the chamber wall by the burning reaction between the O2 and the metal particles, wherein the set second pressure is higher than the set first pressure;

S2: exhausting and pumping down the chamber;
S3: cleaning the electrostatic chuck in the chamber and the chamber wall by a burning reaction between NF3/Cl2 and the metal particles;
S4: exhausting and pumping down the chamber; and
S5: opening the chamber of the metal etching machine for preventative maintenance.