Patent ID: 6259072
Filing Date: 2001-07-10
Classification: H01L

Abstract:
A plasma processing device (10) comprising:(i) a plasma generator (14);(ii) a processing chamber (16) in communication with said plasma generator (14) such that plasma within said generator may pass into said chamber and react with the surface of a substrate (18) residing therein;(iii) a radiant heater assembly (20) for heating the substrate (18), comprising a plurality of radiant heating elements (58) arranged in a plurality of zones (a-n), each zone comprising at least one heating element, and a focused reflector (56) for focusing radiant energy from the heating elements toward the substrate;(iv) a feedback mechanism (24) for providing a substrate temperature feedback signal (25);(v) a controller (22) for receiving a temperature setpoint signal (27) and the temperature feedback signal (25) and in response thereto independently controlling power applied to the plurality of zones of radiant heating elements, wherein said controller (22) operates in at least a first ramp state (82) and a second steady state (84), depending upon the magnitude of difference (.DELTA.) between said temperature setpoint signal (27) and said temperature feedback signal (25); and(vi) a power controller (90) for independently controlling power applied to the plurality of zones (a-n) of radiant heating elements in at least said steady state (84) based on stored temperature zone maps (88).