Patent ID: 7850174
Filing Date: 2010-12-14
Classification: H01J,H01L,Y10T

Abstract:
1. A plasma processing apparatus comprising: a plasma processing chamber; a susceptor installed within the plasma processing chamber, the susceptor being made of an electrically conductive material; an electrostatic chuck formed on the susceptor for mounting thereon a substrate to be processed; a ring member directly disposed on the susceptor wherein an innermost circumference of the ring member surrounds a periphery of the substrate to be processed with a gap between the innermost circumference of the ring member and the periphery of the substrate to be processed when the substrate to be processed is mounted on the electrostatic chuck, the ring member comprising an electrically conductive material; and a lower ring body disposed directly below the periphery of the substrate to be processed and directly below at least a portion of the ring member wherein the lower ring body surrounds a periphery of the electrostatic chuck, wherein when the substrate to be processed is mounted on the electrostatic chuck, a part of an upper surface of the lower ring body is disposed directly below the gap between the innermost circumference of the ring member and the periphery of the substrate to be processed, wherein the susceptor includes a first surface on which the electrostatic chuck is directly mounted; a second surface on which the ring member is directly mounted; and a third surface on which the lower ring body is directly mounted, the third surface being disposed outside the first surface and inside the second surface, and wherein a height of an upper surface of the electrostatic chuck is substantially equal to a height of the second surface, and a height of the upper surface of the lower ring body is lower than the height of the second surface.