Film formation apparatus and method for using the same
View Patent ↗A method for using a film formation apparatus for a semiconductor process includes a first cleaning process of removing by a first cleaning gas a by-product film from an inner surface of a reaction chamber of the film formation apparatus, while supplying the first cleaning gas into the reaction chamber, and setting an interior of the reaction chamber at a first temperature and a first pressure to activate the first cleaning gas. The method further includes a second cleaning process of then removing by a second cleaning gas a contaminant from the inner surface of the reaction chamber, while supplying the second cleaning gas into the reaction chamber, and setting the interior of the reaction chamber at a second temperature and a second pressure to activate the second cleaning gas. The second cleaning gas includes a chlorine-containing gas.
1. A method for using a film formation apparatus for a semiconductor process, the apparatus including a reaction chamber configured to accommodate a holder that supports a plurality of target substrates at intervals in a vertical direction, the method comprising:
performing a film formation process of forming a product film by CVD on the target substrates supported on the holder inside the reaction chamber, while supplying a first film formation gas and a second film formation gas into the reaction chamber, the product film being a film of a substance selected from the group consisting of silicon nitride, silicon oxide, and silicon oxynitride, the first film formation gas being selected from the group consisting of dichlorosilane, tetrachlorosilane, hexachlorodisilane, and trichlorosilane, and the second film formation gas being selected from the group consisting of a nitride gas, an oxidizing gas, and an oxynitriding gas;
then unloading the holder with the target substrates supported thereon from the reaction chamber;
then performing a first cleaning process of removing a by-product film generated by the film formation process from an inner surface of the reaction chamber, while supplying a first cleaning gas containing a halogen and hydrogen as elements into the reaction chamber, and setting an interior of the reaction chamber at a first temperature of less than 400° C. and a first pressure of 13.3 Pa to 66.5 kPa to activate the first cleaning gas; and
then, in succession to the first cleaning process, without any film formation process interposed therebetween, performing a second cleaning process of removing a metal contaminant from the inner surface of the reaction chamber, while supplying the first film formation gas as a second cleaning gas into the reaction chamber without supplying the second film formation gas into the reaction chamber, and setting the interior of the reaction chamber at a second temperature of 200 to 700° C. and a second pressure of 13.3 Pa to 53,332 Pa to activate the second cleaning gas.
2. The method according to claim 1 , wherein the metal contaminant comprises one or more metals selected from the group consisting of Fe, Al, Ni, Co, Na, and Ca.
3. The method according to claim 1 , wherein the inner surface of the reaction chamber contains as a main component a material selected from the group consisting of quartz and silicon carbide.
4. The method according to claim 1 , wherein the second temperature is set to be 200 to 500° C.
5. The method according to claim 1 , wherein the second pressure is set to be 13.3 Pa to 13.333 Pa.
6. The method according to claim 1 , wherein the first cleaning gas comprises a gas containing no chlorine, which is selected from the group consisting of a halogen-containing acidic gas, and a mixture gas of a halogen gas and hydrogen gas.
7. The method according to claim 1 , wherein the first temperature is set to be 250 to 380° C.
8. The method according to claim 1 , wherein the first pressure is set to be 13.3 kPa to 59.85 kPa.
9. The method according to claim 1 , wherein supply of the first cleaning gas is switched to supply of the second cleaning gas with a period interposed therebetween of supplying an inactive gas into the reaction chamber while not supplying the first and second cleaning gases.
10. The method according to claim 1 , wherein the film formation process is arranged to use a process pressure of 13.3 Pa to 13,333 Pa.
11. The method according to claim 1 , wherein the first film formation gas is dichlorosilane.
12. The method according to claim 1 , wherein the second film formation gas is a nitriding gas.
13. The method according to claim 1 , wherein the second film formation gas is ammonia.
14. The method according to claim 4 , wherein the first pressure is set to be 13.3 kPa to 59.85 kPa and the second pressure is set to be 13.3 Pa to 13,333 Pa.
15. The method according to claim 1 , wherein the second cleaning process is performed without supplying any gas other than the first film formation gas into the reaction chamber.