Patent ID: 7959737
Filing Date: 2011-06-14
Classification: C23C,Y02C,Y02P,Y10S

Abstract:
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.