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    Influence of Gas Composition on Wafer Temperature Control in a Tungsten Chemical Vapor Deposition Reactor

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    No. of downloads: 450

    Date
    2000
    Author
    Chang, Hsiao-Yung
    Adomaitis, Raymond A.
    Kidder, John N., Jr.
    Rubloff, Gary W.
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    Abstract
    Experimental measurements of wafer temperature in a single-wafer,lamp-heated CVD system were used to study the wafer temperature responseto gas composition. A physically based simulation procedure for theprocess gas and wafer temperature was developed in which a subset ofparameter values were estimated using a nonlinear, iterative parameteridentification method, producing a validated model with true predictivecapabilities. <p>With process heating lamp power held constant, wafertemperature variations of up to 160 degrees K were observed by varying feed gasH_2/N_2 ratio. Heat transfer between the wafer and susceptor wasstudied by shifting the instrumented wafer off the susceptor axis,exposing a portion of the wafer backside to the chamber floor. Modelpredictions and experimental observations both demonstrated that the gasvelocity field had little influence on the observed wafer and predictedgas temperatures.
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    http://hdl.handle.net/1903/6127
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