Patent ID: 8236692

Claim:
A method of manufacturing a semiconductor device, comprising: loading a substrate into a process chamber; forming a film comprising a plurality of elements on the substrate by supplying a first source gas and a second source gas into the process chamber through a first gas introducing part and a second gas introducing part, respectively, the first source gas comprising at least one of the plurality of elements and the second source gas comprising at least one of the plurality of elements other than those of the first source gas; unloading the substrate from the process chamber after the film is formed on the substrate; performing a first cleaning process so as to remove a first deposition substance attached to an inner wall of the first gas introducing part by supplying a cleaning gas to the first gas introducing part, the first deposition substance comprising the at least one of the plurality of elements of the first source gas as a main component, wherein a cleaning condition is set according to an accumulated supply time of the first source gas supplied into the process chamber through the first gas introducing part; and performing a second cleaning process so as to remove a second deposition substance attached to an inside of the process chamber and having a different chemical composition from that of the first deposition substance by supplying the cleaning gas into the process chamber through a third gas introducing part connected to a lower side of the process chamber at a position where the substrate is not placed, the second deposition substance comprising the plurality of elements as main components, wherein the cleaning condition is set according to an accumulated thickness of the film formed on the substrate, wherein the first source gas comprises a silicon-containing gas, and the second source gas comprises a nitrogen-containing gas, and wherein the cleaning gas comprises: at least one of nitrogen trifluoride (NF 3 ) gas, chlorine trifluoride (ClF 3 ) gas, fluorine (F 2 ) gas, hydrogen fluoride (HF) gas, chlorine (Cl 2 ) gas and boron trichloride (BCl 3 ) gas.