Patent ID: 11923229
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A plasma processing apparatus, comprising:
a plasma processing chamber;
an electrode in the plasma processing chamber;
an electrostatic chuck in the plasma processing chamber, the electrostatic chuck adsorbing a substrate thereto by a voltage supplied to the electrode;
a switch between the electrode and a power supply that supplies the voltage to the electrode;
a gas supply to supply a processing gas into the plasma processing chamber;
an RF power supply to supply an RF power into the plasma processing chamber; and
a control circuit configured to:
(a) control the switch to supply the voltage from the power supply to the electrode, thereby adsorbing the substrate onto an upper surface of the electrostatic chuck,
(b) after the voltage supplied to the electrode is stabilized to reach a predetermined value, control the switch to cut off supply of the voltage from the power supply to the electrode, thereby bringing the electrode into a floating state and
(c) after the voltage supplied to the electrode is stabilized to reach the predetermined value and the supply of the voltage to the electrode is cut off, control the RF power supply to supply the RF power into the plasma processing chamber, thereby turning the processing gas supplied into the plasma processing chamber into a plasma, and performing a predetermined processing with the plasma on a surface of the substrate adsorbed onto the electrostatic chuck in a state where the electrode is in the floating state.