Patent ID: 10991591

Abstract:
The reactive ion etching apparatus of this invention has a stage provided with an electrostatic chuck having a pair of electrodes. At the time of etching a to-be-processed substrate, by applying DC voltage to the pair of electrodes, the to-be-processed substrate is electrostatically absorbed to the electrostatic chuck. In this reactive ion etching apparatus, a radio-frequency power source connected to the stage, through a first output line, applies bias potential to the to-be-processed substrate. The radio-frequency power source is also arranged to be connected through a second output line to the pair of electrodes so as to apply radio-frequency potential in a manner to be superposed on the DC voltage. The first capacitor and the second capacitor are respectively interposed in the first output line and the second output line. A capacitance ratio of the first capacitor to the second capacitor is set to a range of 2.5 to 25.