Patent ID: 9607874
Date: 2017-03-28
CPC Classifications: H01J,H01L

Claim:
1. A plasma processing method comprising: mounting a processing object wafer on an upper surface of a stage arranged inside of a vacuum chamber and at a pressure-reduced inner side of the vacuum chamber; supplying power to an electrode arranged at an upper part of the stage to electrostatically attract and hold the wafer on the upper surface of the stage; and forming plasma in the processing chamber and supplying high-frequency power to the stage to conduct processing of the wafer, wherein the method includes a plurality of processing steps of conducting processing of the wafer under different conditions and a plurality of periods when formation of plasma is stopped between the processing steps, wherein voltage supplied to the electrode is changed according to a balance of respective polarities of particles floating and charged in the processing chamber in each period when formation of the plasma is stopped.