Patent ID: 6468384
Filing Date: 2002-10-22
Classification: H01J,H01L

Abstract:
A plasma processing system for providing a set-point temperature for substrates during plasma processing, comprising:a plasma chamber arranged to receive an RF power and a source gas for producing plasma, the plasma chamber including an electrostatic chuck for clamping a substrate in place during plasma processing, the electrostatic chuck including an electrode and a sensor, the sensor being arranged to monitor temperature of the substrate; a controller coupled to the sensor to receive the substrate temperature, the controller generating a control signal for driving the substrate temperature to the set-point temperature; and an electrostatic power supply coupled between the controller and the electrode in the electrostatic chuck, the electrostatic power supply receiving the control signal from the controller and generating a voltage adapted to clamp the substrate with a clamping force, wherein the electrostatic power supply provides the voltage to the electrode to clamp the substrate such that the substrate temperature is driven to the set-point temperature; wherein the controller generates the control signal by determining the rate of temperature change for the substrate, and stores one or more lookup tables, each lookup table associating rates of temperature changes and a plurality of parameter values with one rate of temperature change being associated with a set of parameter values, wherein the controller selects a set of parameter values associated with the determined rate of temperature change and generates the control signal.