Optimization of Multijunction Solar Cells Through Indoor Energy Yield Measurements

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11 Scopus Citations


The variability of the solar spectra in the field may reduce the annual energy yield of multijunction solar cells. It would, therefore, be desirable to implement a cell design procedure based on the maximization of the annual energy yield. In this study, we present a measurement technique to generate maps of the real performance of the solar cell for a range of light spectrum contents using a solar simulator with a computer-controllable spectral content. These performance maps are demonstrated to be a powerful tool for analyzing the characteristics of any given set of annual spectra representative of a site and their influence on the energy yield of any solar cell. The effect of luminescence coupling on buffering against variations of the spectrum and improving the annual energy yield is demonstrated using this method.

Original languageAmerican English
Article number6945808
Pages (from-to)438-445
Number of pages8
JournalIEEE Journal of Photovoltaics
Issue number1
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2011-2012 IEEE.

NREL Publication Number

  • NREL/JA-5J00-61333


  • Energy yield
  • luminescence coupling (LC)
  • multijunction solar cell
  • variable spectrum


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