Patent ID: 8186300

Claim:
A plasma processing apparatus for processing a surface of a substrate, which is located in a processing chamber, by using a plasma which is generated inside the processing chamber, comprising: the processing chamber: a first electrode which is provided in said processing chamber and on which the substrate is located; a second electrode arranged above and in opposition to said first electrode at an upper portion of the processing chamber; a main power source for supplying said second electrode with power for generating the plasma; a biasing power source for supplying said first electrode with biasing power; a gas supplying unit for supplying a processing gas into said processing chamber; and a control unit is provided to control said main power source, said biasing power source and said gas supplying unit, wherein said control unit is configured to perform a control such that, during a time of transition to a plasma quenching from a stationary state of plasma in which the processing of the substrate is carried out in a state that an output of the main power source is set to be equal to or smaller than an output of the biasing power source, the output of said main power source and the output of said biasing power source are reduced while the output of said main power source is kept to be equal to or smaller than the output of said biasing power source and thereafter the plasma is quenched.