Patent ID: 8679989

Claim:
A method of manufacturing a semiconductor device, comprising: carrying a substrate into a process chamber; depositing a thin film on the substrate by supplying inside the process chamber (a) through a first supply portion, a first film deposition gas including at least one element among plural elements composing the thin film to be deposited and capable of depositing a film by itself and (b) through a second supply portion a second film deposition gas including at least another element among the plural elements and incapable of depositing a film by itself, while heating an interior of the process chamber and an interior of the first supply portion at a same temperature at which the first film deposition gas undergoes heat decomposition; carrying the substrate on which the thin film is deposited out from inside the process chamber; and removing a first deposit deposited on an interior surface of the process chamber and including the plural elements and a second deposit deposited on an interior surface of the first supply portion, including the at least one element and having a chemical composition different from a chemical composition of the first deposit, through etching reaction respectively, by supplying a cleaning gas inside the process chamber and inside the first supply portion while changing at least one of a supply flow rate, a concentration, and/or a material between a cleaning gas to be supplied inside the process chamber and a cleaning gas to be supplied inside the first supply portion, while heating the interior of the process chamber and the interior of the first supply portion at a same temperature.