Patent ID: 7938931

Claim:
A plasma processing chamber configured to clean a bevel edge of a substrate, comprising: a bottom electrode configured to receive the substrate, wherein the bottom electrode is coupled to a radio frequency (RF) power supply, the bottom electrode having a bottom electrode surface that receives the substrate; a top edge electrode surrounding an insulating plate opposing the bottom electrode, the top edge electrode being electrically grounded and separated from the insulator plate by a top dielectric ring; and a bottom edge electrode surrounding the bottom electrode and separated from the bottom electrode by a bottom dielectric ring, the bottom edge electrode opposing the top edge electrode, wherein a cleaning plasma is generated between the top edge electrode and the bottom edge electrode to clean the bevel edge of the substrate when disposed on the bottom electrode and the bevel edge of the substrate is exposed between the bottom edge electrode and the top edge electrode, the top edge electrode and the bottom edge electrode being electrically coupled to ground to provide a return electrical path to ground; a top insulator ring surrounding the top edge electrode; and a bottom insulator ring surrounding the bottom edge electrode; wherein each of the top and bottom edge electrodes have opposing electrode surfaces that are spaced apart from the bottom electrode surface, and the top and bottom insulator rings have exposed and opposing surfaces that are substantially aligned with the opposing electrode surfaces.