Patent ID: 9732909
Date: 2017-08-15
CPC Classifications: C23C,F17D,H01J,H01L,Y10T

Claim:
1. A gas supply method for use with a substrate processing apparatus including a gas supply system and a processing chamber in which a substrate is processed, the method comprising: supplying a first gas into the processing chamber through a first gas supply line; and supplying a second gas to the first gas supply line through a second gas supply line connected to the first gas supply line, wherein, before processing the substrate, the first gas is supplied at a first flow rate, and then the second gas is initially supplied at an initial flow rate Fa, which is greater than a second flow rate, and then is supplied at the second flow rate after a lapse of an initial time period, and wherein the method further comprising: obtaining, based on an inner volume of the second gas supply line in which the second gas flows and an inner pressure of the first gas supply line into which the second gas from the second gas supply line flows, an initially set flow rate Fa′ , which is a flow rate required for an inner pressure of the second gas supply line to reach the inner pressure of the first gas supply line at the lapse of the initial time period; and setting the initially set flow rate Fa′ as the initial flow rate Fa if the initially set flow rate Fa′ is not greater than a maximum allowable flow rate Fa″ of the second gas supply line.