Patent ID: 9412562
Filing Date: 2016-08-09
CPC Classification: H01J

Claim Text:
1. A capacitive coupling plasma processing apparatus comprising; a chamber configured to maintain a vacuum atmosphere; first and second electrodes disposed opposite to each other inside the chamber; and a plasma generation mechanism configured to generate process gas plasma by forming a radio frequency (RF) electric field between the first and second electrodes, wherein the plasma generation mechanism includes an RF power supply connected to the first electrode, the first electrode is configured to support a process target substrate and to be supplied with an RF power from the RF power supply, the second electrode includes a plurality of segments separated in concentric state and disposed at a position opposite to the first electrode, and a conductive main body supporting the plurality of segments through a planar insulating film in an integrated state, such that the main body is grounded and the plurality of segments are set in a floating state or is grounded via a conductive portion, the apparatus further comprises variable direct current (DC) power supplies for applying a DC voltage to at least one of the plurality of segments, to control spatial electric potential distribution in radial directions of the second electrode by applying a DC voltage to at least one of the plurality of segments from the variable DC power supplies, and the plurality of segments include a first segment and a second segment, and the variable DC power supplies include a first variable DC power supply configured to apply a DC voltage to the first segment, and a second variable DC power supply configured to apply a DC voltage to the second segment independently of the first segment.