Patent ID: 7494561
Filing Date: 2009-02-24
Classification: H01J

Abstract:
1. A plasma processing apparatus comprising: a process container configured to have a vacuum atmosphere therein; a first upper electrode disposed to have a ring shape and to face a target substrate placed at a predetermined position within the process container; a second upper electrode disposed radially inside the first upper electrode and electrically insulated therefrom; a process gas supply system configured to supply a process gas into the process container; a first RF power supply configured to output a first RF; a first electric feeder configured to supply the first RF output from the first RF power supply, to the first upper electrode at a first power value; and a second electric feeder branching from the first electric feeder and configured to supply the first RF output from the first RF power supply, to the second upper electrode at a second power value smaller than the first power value, wherein the first upper electrode comprises a protrusion extending downward and having a protrusion surface present below a bottom surface of the second upper electrode and a falling surface positioned radially at an inside of the protrusion and extending downward toward the protrusion surface such that the protrusion surface is disposed to be radially outside the substrate placed at the predetermined position within the process container, wherein an insulating member is interposed between a wall of the process container and the first upper electrode, and wherein a shield member is disposed not to cover the falling surface but to cover the protrusion surface and a bottom surface of the insulating member so as to prevent the first RF from being supplied from the protrusion surface and a bottom surface of the insulating member into the plasma process space.