Patent ID: 8481434

Claim:
A method of manufacturing a semiconductor device comprising: loading a substrate into a processing chamber; performing processing to deposit a high dielectric constant film on the substrate by supplying processing gas into the processing chamber; unloading the processed substrate from the processing chamber; and cleaning an inside of the processing chamber by supplying halide gas and oxygen based gas into the processing chamber, and causing a reaction between the halide gas and the oxygen based gas, and removing deposits including the high dielectric constant film deposited on the inside of the processing chamber by thermal etching without using plasma, wherein a temperature in the processing chamber is set to 400° C. or more and 600° C. or less, and a pressure in the processing chamber is set to 13.3 Pa or more and 66500 Pa or less, and a concentration of the oxygen based gas in the halide gas and the oxygen based gas is set to be 5% or less, to thereby suppress generating reaction restrain species, which restrains a progress of the thermal etching, by a reaction between the halide gas and the oxygen based gas, and accelerate the progress of the thermal etching, in the cleaning of the inside of the processing chamber.