Patent ID: 8808455

Claim:
A substrate processing apparatus comprising: a reaction tube configured to stack and accommodate a plurality of substrates; a first processing gas supply system configured to supply a first processing gas into the reaction tube; a second processing gas supply system configured to supply a second processing gas into the reaction tube; and a control unit configured to control the first processing gas supply system and the second processing gas supply system, wherein at least one of the first processing gas supply system and the second processing gas supply system includes two nozzles having different shapes, the two nozzles being disposed inside the reaction tube and vertically arranged along a stacking direction of the substrates, and wherein the control unit is configured to control the first processing gas supply system, when the first processing gas and the second processing gas are supplied into the reaction tube at pulses having different film-forming rates to form a film on the substrates, to supply the first processing gas through a first nozzle of the two nozzles at a first flow rate after supplying the first processing gas through a second nozzle of the two nozzles at a second flow rate.