Method of manufacturing semiconductor device

1. A method of manufacturing a semiconductor device, comprising:

(a) loading a substrate into a process chamber;

(b) forming a silicon film or a silicon compound film on the substrate loaded in the process chamber by supplying a raw-material gas to a gas supply pipe disposed in the process chamber to introduce the raw-material gas into the process chamber;

(c) unloading the substrate from the process chamber;

(d) heating an inside of the process chamber after unloading the substrate to generate a crack in a thin film formed inside the process chamber;

(e) decreasing an inside temperature of the process chamber after carrying out the step (d) with the substrate unloaded from the process chamber; and

(f) introducing a cleaning gas into the process chamber by supplying the cleaning gas to the gas supply pipe after the step (e) with the substrate unloaded from the process chamber.

2. The method of claim 1 , wherein in the step (d), the inside of the process chamber is heated to a temperature of 600° C. to 900° C.;

in the step (e), the inside temperature of the process chamber is decreased to a temperature of 350° C. to 550° C.; and

in the step (f), the inside temperature of the process chamber is maintained in a range from 350° C. to 550° C.