Patent ID: 8591754

Claim:
A plasma processing method comprising: providing a tray formed with a plurality of substrate accommodation holes penetrating through a thickness thereof, and provided with a substrate support portion for each of the substrate accommodation holes that supports an outer peripheral portion of a lower surface of the substrate accommodated in the substrate accommodation hole; providing an upper portion arranged in a chamber and provided with a tray support portion, a plurality of substrate placement portions, and a concave portion formed in each of the substrate placement portions; carrying the tray into the chamber with the substrate being accommodated in the substrate accommodation hole and the outer peripheral portion of the lower surface of the substrate being supported by substrate support portion; moving down the tray toward the upper portion so that the lower surface of the tray is supported on the tray support portion, so that the lower surface of the substrate is placed on the substrate placement portion, and so that the tray support portion is accommodated in the concave portion; applying a dc voltage to an electrostatic attraction electrode so that the substrate is electrostatically attracted on the substrate placement portion, followed by that heat conducting gas is supplied to a space between the substrate and the substrate placement portion; and generating plasma in the chamber with supplying an etching gas in the chamber.