Film formation apparatus and methods including temperature and emissivity/pattern compensation
First Claim
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1. A substrate processing system comprising:
- a processing chamber adapted for the formation of films on the substrate, the chamber including a sidewall surrounding the periphery of the chamber;
a substrate support disposed in the system and adapted to support the substrate;
a top cover disposed above the substrate support to enclose the processing chamber, the top cover comprising a reflective surface for reflecting light back towards the substrate support;
a heating system disposed under the substrate support to heat the substrate to a temperature sufficient for film formation processes, wherein process heating of the substrate is performed exclusively by the heating system;
a plurality of optical probes for collecting light emanating from the substrate, the reflective surface comprising a plurality of openings to provide respective fields of view of the substrate to the optical probes; and
an emissometer for measuring the actual emissivity of the substrate, wherein a temperature of the substrate is calculated utilizing output from at least one of the optical probes and the emissometer.
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Abstract
A film formation system 10 has a processing chamber 15 bounded by sidewalls 18 and a top cover 11. In one embodiment, the top cover 11 has a reflective surface 13 for reflecting radiant energy back onto a substrate 19, pyrometers 405 for measuring the temperature of the substrate 19 across a number of zones, and at least one emissometer 410 for measuring the actual emissivity of the substrate 19. In another embodiment, a radiant heating system 313 is disposed under the substrate support 16. The temperature of the substrate 19 is obtained from pyrometric data from the pyrometers 405, and the emissometer 410.
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21 Claims
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1. A substrate processing system comprising:
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a processing chamber adapted for the formation of films on the substrate, the chamber including a sidewall surrounding the periphery of the chamber;
a substrate support disposed in the system and adapted to support the substrate;
a top cover disposed above the substrate support to enclose the processing chamber, the top cover comprising a reflective surface for reflecting light back towards the substrate support;
a heating system disposed under the substrate support to heat the substrate to a temperature sufficient for film formation processes, wherein process heating of the substrate is performed exclusively by the heating system;
a plurality of optical probes for collecting light emanating from the substrate, the reflective surface comprising a plurality of openings to provide respective fields of view of the substrate to the optical probes; and
an emissometer for measuring the actual emissivity of the substrate, wherein a temperature of the substrate is calculated utilizing output from at least one of the optical probes and the emissometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of measuring temperature in a chamber adapted to form films on a substrate surface comprising:
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measuring radiation emitted only from the substrate during processing to provide a first measurement;
measuring radiation reflected from the processing chamber and emitted from the substrate to provide a second measurement;
comparing the first and second measurements;
calculating the actual wafer emissivity; and
correcting the second measurement to obtain a temperature value.
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Specification