Patent ID: 9620336
Date: 2017-04-11
CPC Classifications: H01J,H01L

Claim:
1. A method for plasma processing a substrate held by a carrier having a frame and a holding sheet, comprising: loading the carrier holding the substrate into a chamber of a plasma processing apparatus so that the carrier is placed on an electrode unit of a stage, the electrode unit incorporating (i) a first electrostatic attraction electrode of unipolar type overlapping the substrate in plan view and (ii) a second electrostatic attraction electrode of bipolar type surrounding the first electrostatic attraction electrode, the second electrostatic attraction electrode overlapping the frame and the holding sheet between the substrate and the frame in the plan view without overlapping the substrate in plan view; electrostatically attracting the substrate by the first electrostatic attraction electrode by applying a first direct current voltage; electrostatically attracting the frame and the holding sheet between the substrate and the frame by the second electrostatic attraction electrode by applying a second direct current voltage; generating plasma in the chamber, thereby plasma processing the substrate.