Patent ID: 8387562
Filing Date: 2013-03-05
Classification: C23C,H01J,H01L

Abstract:
1. A plasma processing apparatus comprising: a processing chamber configured to generate a plasma therein; a susceptor, installed in the processing chamber, configured to mount a substrate to be processed thereon, the susceptor serving as an electrode; and a focus ring disposed on a peripheral portion of the susceptor and configured to surround a periphery of the substrate, wherein the focus ring mounted on the susceptor includes: a first ring member having a surface exposed to the plasma; a second ring member being disposed directly under the first ring member; and a third ring member made of an electrically insulating material and configured to mount the first ring member thereon and to provide a small gap between the first ring member and the second ring member such that there is no direct electrical conductive contact established between the first ring member and the second ring member and an electrical potential of the first ring member is not equal to that of the second ring member, wherein a portion of the third ring member is directly disposed on the susceptor, wherein there is a gap between the second ring member and the third ring member, wherein a portion of the second ring member is positioned above a bottom part of the first ring member and there is a gap between the first ring member and the portion of the second ring member, and wherein the first ring member and the second ring member are made of an electrically conductive material.