Patent ID: 8440050

Claim:
A plasma processing apparatus comprising: a vacuum evacuable processing chamber accommodating therein a substrate to be processed; a first electrode provided in the processing chamber and divided into an outer electrode forming an outer portion of the first electrode and an inner electrode forming a central portion of the first electrode; a second electrode disposed in the processing chamber so as to face the first electrode and supporting the substrate to be processed; a first high frequency power application unit configured to apply to the second electrode a first high frequency power having a relatively high frequency; a second high frequency power application unit configured to apply to the second electrode a second high frequency power having a relatively low frequency; a first DC voltage application circuit configured to apply a DC voltage to the outer electrode; a second DC voltage application circuit configured to apply a DC voltage to the inner electrode; and a processing gas supply unit configured to supply a processing gas into the processing chamber, wherein a space between the first electrode and the second electrode serves as a plasma generation space, and wherein the outer electrode has a frequency-impedance characteristic seen from the plasma generation space such that an increase of DC voltage to the outer electrode increases impedance of the outer electrode at the frequency of the second high frequency power, and an increase of DC voltage to the outer electrode decreases impedance of the outer electrode at the frequency of the first high frequency power.