Patent ID: 8475624

Claim:
A plasma etch processing chamber configured to clean a bevel edge of a substrate, comprising: a bottom edge electrode surrounding a substrate support of the plasma processing chamber, wherein the substrate support is configured to receive the substrate; the bottom edge electrode and the substrate support are electrically isolated from each other by a bottom dielectric ring; a top edge electrode defined over the bottom edge electrode, the top edge electrode and the bottom edge electrode are configured to generate a cleaning plasma to clean the bevel edge of the substrate; an inductive coil surrounding the bevel edge of the substrate, wherein the top and bottom electrodes are grounded when the inductive coil generates a plasma; a gas feed defined through a side surface of the processing chamber, the gas feed introducing a processing gas for striking a plasma defined between the top edge electrode and the bottom edge electrode; and a pump out port defined through a top surface of the chamber, the pump out port located at a radial distance from a center axis of the substrate, wherein a distance of an inlet of the pump out port from a top surface of a substrate is about 4 mm thereby enabling pressure gradients to exist over a top surface of the substrate to substantially flatten a warped substrate during cleaning of the bevel edge.