Patent ID: 9275836
Filing Date: 2016-03-01
CPC Classification: H01J

Claim Text:
1. A plasma processing method using a plasma processing apparatus including a processing chamber that accommodates a substrate therein; a lower electrode positioned within the processing chamber and serving as a mounting table on which the substrate is mounted; an upper electrode positioned to face the lower electrode within the processing chamber; a first high frequency power supply that applies high frequency power for plasma generation of a first frequency to the lower electrode; a second high frequency power supply that applies high frequency power for ion attraction of a second frequency lower than the first frequency to the lower electrode; first and second bias distribution control electrodes positioned above the lower electrode and within an insulator while being separated from and electrically insulated from the lower electrode by the insulator; first and second bias distribution control power supplies configured to apply a square wave voltage of a third frequency lower than the second frequency to the first and second bias distribution control electrode; a focus ring installed on a peripheral portion of a top surface of the lower electrode; a third bias distribution control electrode positioned below the focus ring; and a third bias distribution control power supply configured to apply the square wave voltage of the third frequency lower than the second frequency to the third bias distribution control electrode, the method comprising: applying a first square wave voltage of the third frequency lower than the second frequency to the first bias distribution control electrode from the first bias distribution control power supply and controlling a bias distribution above the lower electrode; applying a second square wave voltage of the third frequency lower than the second frequency to the second bias distribution control electrode from the second bias distribution control power supply and controlling a bias distribution above the lower electrode; applying a third square wave voltage of the third frequency lower than the second frequency to the third bias distribution control electrode from the third bias distribution control power supply and controlling a bias distribution above the lower electrode; applying a DC voltage to the first bias distribution control electrode from an electrostatic chuck DC power supply to control the first bias distribution control electrode to serve as an electrode of an electrostatic chuck configured to electrostatically attract the substrate; and applying a DC voltage to the second bias distribution control electrode from the electrostatic chuck DC power supply to control the second bias distribution control electrode to serve as an electrode of the electrostatic chuck configured to electrostatically attract the substrate, wherein the first bias distribution control electrode is positioned at a central portion of the insulator, and the second bias distribution control electrode is positioned at a peripheral portion of the insulator while being concentrically arranged with the first bias distribution control electrode, the first bias distribution control electrode is electrically connected with the electrostatic chuck DC power supply and the first bias distribution control power supply, the second bias distribution control electrode is electrically connected with the electrostatic chuck DC power supply and the second bias distribution control power supply, and the third bias distribution control electrode is electrically connected with the third bias distribution control power supply without being connected with an electrostatic chuck DC power supply, and without being connected with the first bias distribution control power supply and the second bias distribution control power supply.