Patent ID: 6921724
Filing Date: 2005-07-26
Classification: H01L

Abstract:
1. A method for etching a wafer within an etch processor, the etch processor including a chuck for holding a wafer and a plurality of temperature sensors reporting at least a temperature of the wafer at an inner region and an outer region, the chuck including a first heater heating the inner region and a second heater heating the outer region, the first and second heaters controlled by a temperature control system, and the plurality of temperature sensors operatively coupled to the temperature control system to maintain the temperature of the chuck at a selectable setpoint temperature, the method comprising: selecting a first inner setpoint temperature and a first outer setpoint temperature, a second inner setpoint temperature and a second outer setpoint temperature; placing the wafer on the chuck; heating the inner region of the chuck to said first inner setpoint temperature and the outer region of the chuck to said first outer setpoint temperature; and ramping the temperature of the chuck from said first inner setpoint temperature to said second inner setpoint temperature and from said first outer setpoint temperature to said second outer setpoint temperature while processing the wafer for a period of time.