Patent ID: 6178919
Filing Date: 2001-01-30
Classification: H01J,Y10S

Abstract:
A plasma processing reactor for processing a substrate comprising:a chamber;a top electrode configured to be coupled to a first RF power source having a first RF frequency;a bottom electrode configured to be coupled to a second RF power source having a second RF frequency that is lower than said first RF frequency;an insulating shroud that lines an interior of said chamber, said insulating shroud being configured to be electrically floating during said processing; anda perforated plasma confinement ring surrounding and disposed outside of an outer periphery of said bottom electrode, said perforated plasma confinement ring being disposed in its entirety at or below a top surface of said substrate, said perforated plasma confinement ring being formed from an electrically conductive material and electrically grounded during said processing so as to increase ion energy during said processing by removing electrons from said plasma.