Patent ID: 7771608
Filing Date: 2010-08-10
Classification: H01J,H01L

Abstract:
1. A method of plasma processing an object material using a plasma processing apparatus including a vacuum processing chamber, a substrate electrode having an electrostatic chucking film for chucking the object material, an electrostatic chucking DC power supply and a substrate bias high-frequency power supply connected to the substrate electrode and a means for generating the plasma in the vacuum processing chamber, comprising the steps of: monitoring a high-frequency voltage applied to the substrate electrode; and controlling the output voltage of the electrostatic chucking DC power supply based on a signal representing the monitored high-frequency voltage to maintain the voltage applied on the electrostatic chucking film at a desired value while at the same time controlling the output of the substrate bias high-frequency power in ramp with time, wherein the rate at which the output of the substrate bias high-frequency power supply is increased or decreased in ramp with time is controlled in such a manner that the change rate is calculated from a selected one of the output voltage of the electrostatic chucking DC power supply and the high-frequency voltage signal and maintained at no more than the desired value.