Patent ID: 6793767
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A wafer stage installed in a process chamber, the wafer stage comprising:an electrostatic chuck support installed in a lower half of an enclosed chamber for supporting an electrostatic chuck; an electrostatic chuck installed on the electrostatic chuck support for chucking and supporting a wafer; a lifting means installed inside the electrostatic chuck and the electrostatic chuck support for lifting the wafer; and a grounding means including: interconnections for connecting the lifting means to ground; and a device for connecting the interconnections, which is installed between the interconnections, for allowing electric current flow and preventing electric current flow, wherein the electrostatic chuck includes a lower electrode which is connected to a DC generator located outside the enclosed chamber for controlling the reaction speed of plasma, an insulating flat plate on an upper portion of the lower electrode, and a plurality of electrostatic electrodes which are connected to a RF generator outside the chamber for generating static electricity.