Compact Spectrum Splitting Photovoltaic Module with High Efficiency

James D. McCambridge, Myles A. Steiner, Blair L. Unger, Keith A. Emery, Eric L. Christensen, Mark W. Wanlass, Allen L. Gray, Laszlo Takacs, Roger Buelow, Timothy A. McCollum, James W. Ashmead, Greg R. Schmidt, Alex W. Haas, John R. Wilcox, James Van Meter, Jeffery L. Gray, Duncan T. Moore, Allen M. Barnett, Richard J. Schwartz

Research output: Contribution to journalArticlepeer-review

93 Scopus Citations


We have designed, fabricated, and tested a small, integrated photovoltaic module comprised of two separately-contacted, high efficiency, multijunction solar cells and non-imaging optics that both concentrate and spectrally split the incoming light. This hybrid design allows us to individually optimize the tandem cells and optical elements. The system has a measured module efficiency, including optical and packaging losses but not power combination losses, of 38.5 ± 1.9% under the AM1.5 direct terrestrial spectrum. The internal optics concentrate the light by a factor of approximately 20. We find excellent agreement between the modeled and measured performance. This is the highest confirmed conversion efficiency demonstrated for a photovoltaic module.

Original languageAmerican English
Pages (from-to)352-360
Number of pages9
JournalProgress in Photovoltaics: Research and Applications
Issue number3
StatePublished - 2011

NREL Publication Number

  • NREL/JA-520-46758


  • high efficiency
  • moderate concentration
  • multijunction
  • photovoltaic
  • spectrum splitting


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