Patent ID: 8398783
Filing Date: 2013-03-19
Classification: H01J,H01L

Abstract:
1. A workpiece de-chucking device of a plasma reactor, the device comprising: a lifting unit for, in response to a lift control signal, lifting a workpiece mounted on a top surface of an ElectroStatic Chuck (ESC) and, when the workpiece is lifted, supporting the workpiece such that a gap between a central part of a bottom surface of the workpiece and the top surface of the ESC is maintained in the same state as a gap between an edge part of the bottom surface of the workpiece and the top surface of the ESC; an Inductively Coupled Plasma (ICP) source power unit comprising an inductive coil and a Radio Frequency (RF) power source supply unit, the inductive coil being arranged outside a dielectric window installed at a top of a reaction chamber having the ESC, and forming a magnetic field when an RF power source is supplied, and the RF power source supply unit supplying the RF power source to the inductive coil in response to a source power control signal; and a controller for controlling an operation of the plasma reactor comprising the reaction chamber and, for the sake of de-chucking the workpiece, outputting the source power control signal, the lift control signal, and a de-chucking control signal, and controlling a mass flow of a de-chuck gas injected into the reaction chamber during the de-chucking of the workpiece and a pressure of the reaction chamber, wherein, as the de-chuck gas is injected into the reaction chamber and the inductive coil forms the magnetic field, antistatic and cleaning plasma is generated in the reaction chamber, in response to the de-chucking control signal, a chucking power source supply unit stops supplying a chucking power source to an electrode of the ESC and connects the electrode of the ESC to the ground, and when the workpiece is lifted by the lifting unit, the antistatic and cleaning plasma permeates into a space between the workpiece and the ESC, promotes discharge of charges existing between the workpiece and the ESC, dry-cleans a surface of the ESC and the inside of the reaction chamber, and eliminates fine dust generated while the workpiece is de-chucked from the ESC by the lifting unit.