Patent ID: 6806438
Filing Date: 2004-10-19
Classification: C23C,H01J,H01L

Abstract:
A plasma processing apparatus comprising a plurality of plasma processing units, each of the plurality of plasma processing units comprising:a plasma processing chamber including an electrode to excite a plasma; a radiofrequency generator to supply radiofrequency power to the electrode; and a matching circuit to match impedances of the plasma processing chamber and the radiofrequency generator, the matching circuit having an input terminal connected to the radiofrequency generator, an output terminal connected to the electrode, and a connection point provided between the input terminal and the output terminal, the matching circuit being connected to a ground potential portion via the connection point, wherein a variation  among the plurality of plasma processing units defined by a first equation below is set at a first value within a first predetermined range: <RA>=(RAmaxâˆ’RAmin)/(RAmax+RAmin) where RAmax and RAmin are maximum and minimum values, respectively, of AC resistances RA in the matching circuits of the plurality of plasma processing units measured from an input-terminal-side of the matching circuits, anda variation  among the plurality of plasma processing units defined by a second equation below is set at a second value within a second predetermined range: <RB>=(RBmaxâˆ’RBmin)/(RBmax+RBmin) where RBmax and RBmin are maximum and minimum values, respectively, of AC resistances RB in the matching circuits of the plurality of plasma processing units measured from an output-terminal-side of the matching circuits.