Processing method in processing apparatus using halogen-based gas
A processing apparatus performs a predetermined process on an object to be processed by supplying halogen-based gas into a chamber in which a vacuum is maintained, to which chamber a member having an oxide film formed on a surface thereof is connected, or which chamber has an oxide film formed on a surface thereof, wherein the predetermined processing is performed on the target object once or a plurality of times in the chamber. Later, oxygen gas or dry air is supplied to the chamber to purge the chamber, and then the chamber is opened and exposed to the atmosphere.
1. A processing method in a processing apparatus which performs a process on a target object by supplying a halogen-based gas through a gas supply line into a chamber while maintaining the chamber in a vacuum state, with an oxide film formed on a surface of the chamber or on a surface of the gas supply line, the method comprising:
performing the process on a target object in the chamber once or multiple times;
removing halogen-based components of the halogen-based gas adhered to the oxide film on the surface of the chamber or on the surface of the gas supply line and reoxidizing corroded oxide film on the surface of the chamber or on the surface of the gas supply line, by supplying oxygen gas into the chamber, without using plasma, through the gas supply line; and
exposing the chamber to an atmosphere,
wherein a concentration of moisture in the oxygen gas supplied into the chamber is 0.5 ppm or less.
2. The processing method of claim 1 , wherein an ion sputtering process is performed together with or before said removing and reoxidizing.
3. The processing method of claim 2 , wherein the ion sputtering process is performed by using argon ions obtained by generating a plasma of argon gas.
4. The processing method of claim 1 , wherein the halogen-based gas is chlorine gas.
5. The processing method of claim 1 , the gas supply line is made of stainless steel, and the oxide film is a passive film made of chromium.
6. A processing method in a processing apparatus which performs a process on a target object by supplying a halogen-based gas through a gas supply line into a chamber while maintaining the chamber in a vacuum state, with an oxide film formed on a surface of the chamber or on a surface of the gas supply line, the method comprising:
performing the process on a target object in the chamber once or multiple times;
removing halogen-based components of the halogen-based gas adhered to the oxide film on the surface of the chamber or on the surface of the gas supply line and reoxidizing corroded oxide film on the surface of the chamber or on the surface of the gas supply line, by generating oxygen plasma in the chamber while supplying only oxygen gas into the chamber through the gas supply line; and
exposing the chamber to an atmosphere,
wherein the halogen-based gas is chlorine gas.
7. The processing method of claim 6 , the gas supply line is made of stainless steel, and the oxide film is a passive film made of chromium.
8. A processing method in a processing apparatus which performs a process on a target object by supplying a halogen-based gas through a gas supply line into a chamber while maintaining the chamber in a vacuum state, with an oxide film formed on a surface of the chamber or on a surface of the gas supply line, the method comprising:
performing the process on a target object in the chamber multiple times while maintaining the chamber in a vacuum state; and
performing idling between the processes performed multiple times,
wherein during said idling, removal of halogen-based components of the halogen-based gas adhered to the oxide film on the surface of the chamber or on the surface of the gas supply line and reoxidization of corroded oxide film on the surface of the chamber or on the surface of the gas supply line are performed by supplying oxygen gas into the chamber, without using plasma, through the gas supply line,
wherein a concentration of moisture in the oxygen gas supplied into the chamber is 0.5 ppm or less.
9. The processing method of claim 8 , wherein the removal and reoxidization performed during said idling are performed by the oxygen gas mixed with nitrogen gas.
10. The processing method of claim 8 , wherein the removal and reoxidization are performed by oxygen gas for a predetermined period of the idling and by nitrogen gas for a remaining period of the idling.
11. The processing method of claim 8 , wherein the halogen-based gas is chlorine gas.
12. The processing method of claim 8 , the gas supply line is made of stainless steel, and the oxide film is a passive film made of chromium.