Thin Film Cadmium Telluride-Cadmium Sulfide Alloys and Devices

    Research output: Contribution to conferencePaper


    The CdTe-CdS alloy system has been characterized at typical solar cell processing temperatures in order to elucidate the role of interdiffusion in CdTe/CdS-based solar cells. Predominately single phase CdTe/sub 1 -x/S/sub x/ thin films with x .ident. [S]+([S][Te]) ranging from 0 to 0.45, were grown by vacuum co-evaporation of CdS and CdTe. Phase segregation was promoted by heat treatment of thefilms at 415 deg. C in the presence of CdCl/sub 2/. The solubility limits of S in CdTe and Te in CdS at 415 deg. C were derived by measuring the compositions of the two phases in the films after the CdCl/sub 2/ treatment. The solubility limit of S in CdTe was determined to be 5.8%. Solar cells were fabricated with compositionally uniform absorber layers of CdTe/sub 1 -x/S/sub x/ with x near thesolubility limit before heat treatment. An efficiency of 10.8% was achieved by a CdTe/sub 1-x/S/sub x//CdS device. The Voc, Jsc, FF and spectral response of this device were all very similar to vacuum evaporated conventional CdTe/CdS cells where the alloy is formed by diffusion of S during cell processing.
    Original languageAmerican English
    Number of pages4
    StatePublished - 1996
    EventTwenty Fifth IEEE Photovoltaic Specialists Conference - Washington, D.C.
    Duration: 13 May 199617 May 1996


    ConferenceTwenty Fifth IEEE Photovoltaic Specialists Conference
    CityWashington, D.C.

    Bibliographical note

    Work performed by the University of Delaware, Newark, Delaware

    NREL Publication Number

    • NREL/CP-22399


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