Patent ID: 8821744

Claim:
A substrate processing method using a substrate processing apparatus, comprising: a first step of applying a negative voltage pulse from a pulsed power supply included in the apparatus; and a second step of applying a floating potential for an interval of time between the negative voltage pulse and a positive voltage pulse from the pulsed power supply subsequent to the negative voltage pulse, wherein the apparatus includes: a chamber; a first electrode provided inside the chamber; a second electrode provided inside the chamber so that the second electrode faces the first electrode and to hold a substrate; an RF power supply to apply an RF voltage having a frequency of 50 MHz or higher to the second electrode; and the pulsed power supply to repeatedly apply a voltage waveform with the RF voltage to the second electrode, the voltage waveform including a negative voltage pulse and a positive voltage pulse, the pulsed power supply including a first power supply to output a first voltage corresponding to a peak voltage of the negative voltage pulse, a second power supply to output a second voltage corresponding to a peak voltage of the positive voltage pulse, a ground terminal to provide a ground potential, and an output terminal to which any one of the first power supply, the second power supply, and the ground terminal is applied, and the floating potential being applied to the second electrode between applying the negative voltage pulse and the positive voltage pulse by disconnecting the output terminal of the pulsed power supply from the first power supply, the second power supply, and the ground terminal.