Patent ID: 7122477

Claim:
A plasma processing method comprising: introducing a substrate into a processing container, a CoSi 2 film being formed on a surface of the substrate, supplying an Ar gas and an H 2 gas into the processing container, and heating the substrate to 200 to 500° C., generating inductive coupling plasma in the processing container and applying a high-frequency bias voltage to the substrate while the Ar gas and the H 2 gas are supplied, so that a natural oxide film formed on a surface of the CoSi 2 film is removed by the plasma, wherein a total gas flow rate of the Ar gas and the H 2 gas is 30 sccm or lower, an etching selective ratio of the natural oxide film with respect to the CoSi 2 film is 3 or more, and in the step of supplying an Ar gas and an H 2 gas into the processing container, the H 2 gas is supplied in such a manner that a flow rate of the H 2 gas is 40% or more with respect to a total gas flow rate.