Patent ID: 7897205

Claim:
A film forming method comprising: pre-coating an inner wall of a processing chamber, including a surface of a mounting table made of ceramic containing a metal oxide and disposed in the processing chamber, with a first silicon-containing nonmetal thin film, by introducing a processing gas containing an inorganic silane gas into the processing chamber; mounting a dummy substrate on the mounting table pre-coated with the first nonmetal thin film; removing the first nonmetal thin film formed on other regions of the mounting table than that covered with the dummy substrate, by introducing a cleaning gas for removing the first nonmetal thin film into the processing chamber; pre-coating the inner wall of the processing chamber and the surface of the mounting table on which the dummy substrate is mounted with a second silicon-containing nonmetal thin film, by introducing a processing gas containing an organic silane gas; unloading the dummy substrate from the processing chamber; mounting a target substrate on the mounting table after the dummy substrate is unloaded; and forming a silicon-containing nonmetal thin film on a surface of the target substrate mounted on the mounting table, by introducing a processing gas containing an organic silane gas.