Patent ID: 7895970

Claim:
A structure for a plasma processing chamber including a container having a process space for receiving a substrate, and a mounting stage disposed in the container, for mounting the received substrate thereon, the mounting stage being connected to at least one high frequency power supply, the structure being disposed in the plasma processing chamber and comprising: a conductive plate-shaped cooling member that is electrically grounded; a plate-shaped electrode that is disposed between said conductive plate-shaped cooling member and the process space and is electrically floating, said plate-shaped electrode having a surface exposed to the process space, said plate-shaped electrode being cooled by said conductive plate-shaped cooling member; an insulating member that includes a first insulation member formed of a dielectric material and a second insulation member formed of an anodized aluminum, and that is disposed between said conductive plate-shaped cooling member and said plate-shaped electrode such as not to generate any gap between said conductive plate-shaped cooling member and said insulating member, between said plate-shaped electrode and said insulating member, and between said first insulation member and said second insulation member; and a support member that includes an buffer chamber therein and is disposed such as not to generate any gap between said conductive plate-shaped cooling member and said support member, wherein said plate-shaped electrode, said insulating member, said conductive plate-shaped cooling member and said support member are superposed in this order to cooperatively compose a showerhead which introduces a gas to the process space, and the showerhead provides a plurality of gas holes that penetrate straight through each of said conductive plate-shaped cooling member, said plate-shaped electrode and said insulating member, respectively, and wherein the plurality of gas holes communicate with the buffer chamber of said support member.