Journal
PROGRESS IN PHOTOVOLTAICS
Volume 19, Issue 3, Pages 352-360Publisher
WILEY
DOI: 10.1002/pip.1030
Keywords
spectrum splitting; high efficiency; multijunction; moderate concentration; photovoltaic
Funding
- Defense Advanced Research Project [HR0011-07-9-0005]
- U.S. Department of Energy [DE-AC36-08GO28308]
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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. Copyright (C) 2010 John Wiley & Sons, Ltd.
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