Outdoor Testing of GaInP2/GaAs Tandem Cells with Top Cell Thickness Varied

    Research output: Contribution to conferencePaper

    Abstract

    In this study, we measure the performance of GaInP2/GaAs tandem cells under direct beam sunlight outdoors in order to quantify their sensitivity to both spectral variation and GaInP2 top-cell thickness. A set of cells with five different top-cell thicknesses was mounted on a two-axis tracker with the incident sunlight collimated to exclude all except the direct beam. Current-voltage (I-V) curveswere taken throughout the course of several days, along with measurements of the direct solar spectrum. Our two major conclusions are: (1) GaInP2/GaAs tandem cells designed for either the ASTM G-173 direct (G-173D) spectrum or the 'air mass 1.5 global' (AM1.5G) spectrum perform the best, and (2) cells can be characterized indoors and modeled using outdoor spectra with the same result. Theseresults are equally valid for GaInP2/GaAs/Ge triple-junction cells.
    Original languageAmerican English
    Number of pages4
    StatePublished - 2005
    EventInternational Conference on Solar Concentrators for the Generation of Electricity or Hydrogen - Scottsdale, Arizona
    Duration: 1 May 20055 May 2005

    Conference

    ConferenceInternational Conference on Solar Concentrators for the Generation of Electricity or Hydrogen
    CityScottsdale, Arizona
    Period1/05/055/05/05

    NREL Publication Number

    • NREL/CP-520-37819

    Keywords

    • concentrator solar cells
    • photovoltaics (PV)
    • PV

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