On-Sun Comparison of GaInP2/GaAs Tandem Cells with Top Cell Thickness Varied

    Research output: Contribution to conferencePaper

    Abstract

    This study compares the on-sun performance of a set of GaInP2/GaAs tandem cells with different GaInP2 top-cell thicknesses. Because high-efficiency III-V cells are best suited to concentrating photovoltaic (CPV) applications, the cells were mounted on a two-axis tracker with the incident sunlight collimated to exclude all except the direct beam. Current-voltage (I-V) curves were taken throughoutthe course of several days, along with measurements of the direct solar spectrum. Our two major conclusions are: (1) GaInP2/GaAs tandem cells designed for an 'air mass 1.5 global' (AM 1.5G) or a 'low aerosol optical depth' (Low AOD) spectrum perform the best, and (2) cells can be characterized indoors and modeled using outdoor spectra to predict the correct result. These results are equallyvalid for GaInP2/GaAs/Ge triple-junction cells.
    Original languageAmerican English
    Number of pages7
    StatePublished - 2005
    Event31st IEEE Photovoltaics Specialists Conference and Exhibition - Lake Buena Vista, Florida
    Duration: 3 Jan 20057 Jan 2005

    Conference

    Conference31st IEEE Photovoltaics Specialists Conference and Exhibition
    CityLake Buena Vista, Florida
    Period3/01/057/01/05

    NREL Publication Number

    • NREL/CP-520-37376

    Keywords

    • concentrating photovoltaics (CPV)
    • current-voltage
    • high-efficiency III-V cells
    • low aerosol optical depth (AOD)
    • on-sun performance
    • PV
    • tandem cells
    • top-cell thickness
    • triple-junction

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