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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