Patent ID: 7820230

Claim:
A plasma doping processing device comprising: a vacuum container having a top plate on an upper portion thereof; a lower electrode that is arranged in the vacuum container, with a substrate serving as a sample being mounted thereon; a high frequency power supply for applying a high frequency power to the lower electrode; a gas exhausting device for exhausting inside of the vacuum container; and a plasma doping gas supply device for supplying a plasma doping gas that contains a doping material gas containing an impurity and a diluting gas into the vacuum container, the plasma doping processing device comprising: a flow-rate measuring device for measuring a flow rate of a substrate-cooling gas supplied between the substrate and the lower electrode so as to measure an amount of leakage of the substrate-cooling gas into the vacuum container; a storage unit for storing relationship information between a plasma doping time and an amount of introduction of the impurity onto the substrate, and selection information correction of which parameter of plasma doping among a concentration of the plasma doping gas and the plasma doping time is carried out, and a control device comprising a control unit for carrying out operation control of the plasma doping, and a determining unit for determining whether or not the substrate-cooling gas is leaked into the vacuum container based upon the amount of leakage controlled by the control unit and measured by the flow-rate measuring device, wherein the control unit of the control device automatically selects either one parameter of the plasma doping among the concentration of the plasma doping gas and the plasma doping time while referring to the selection information stored in the storage unit, in a case where the determining unit determines that the substrate-cooling gas is leaked into the vacuum container, and when correction of the plasma doping time is selected, a period of the plasma doping processing time is determined based on the relationship information between the plasma doping time and the amount of the introduction of the impurity onto the substrate stored in the storage unit, the control unit of the control device controls operation of the high frequency power supply, the gas exhausting device, and the plasma doping gas supply device so as to prolong the plasma doping time up to the time thus determined, and when correction of the concentration of the plasma doping gas is selected, the control unit of the control device controls operation of the plasma doping gas supply device so as to reduce the amount of supply of the diluting gas that is equivalent to the amount of leakage measured by the flow-rate measuring device, thus controlling operation of the plasma doping gas supply device so as to reduce the amount of supply of the diluting gas in accordance with the amount of leakage measured by the flow-rate measuring device.