The sun is the most abundant source of carbon-free sustainable energy, but current solar cells can only capture energy from a limited portion of the solar spectrum—specifically those photons with energies above the solar cell bandgap. Here, we explore a promising approach to reduce such transmission losses: placing an upconverter behind the solar cell. Upconverting materials can absorb low-energy photons and emit higher-energy photons back toward the solar cell, thereby improving the cell’s photocurrent. An ideal upconverter can increase the efficiency of an ideal solar cell from 30% to 44%. Existing upconverting materials offer much smaller improvements, though a boost in their upconverter efficiency could yield an absolute increase in solar cell efficiency of over 2%. We discuss several schemes to improve upconverter efficiency, focusing on the use of nanophotonic and plasmonic antennas to increase the absorption and emission of upconverters. These schemes can in theory enable orders-of-magnitude improvement in upconverter efficiency, positioning the technology for significant commercial applications.
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30 March 2015
PHYSICS OF SUSTAINABLE ENERGY III (PSE III): Using Energy Efficiently and Producing It Renewably
8–9 March 2014
Berkeley, California
Research Article|
March 30 2015
Upconversion for enhanced photovoltaics
Justin A. Briggs;
Justin A. Briggs
Department of Applied Physics, Stanford University, Stanford, CA 94305,
USA
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Di M. Wu;
Di M. Wu
Department of Chemistry, Stanford University, Stanford, CA 94305,
USA
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Ashwin C. Atre;
Ashwin C. Atre
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305,
USA
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Aitzol Garcia-Etxarri;
Aitzol Garcia-Etxarri
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305,
USA
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Jennifer A. Dionne
Jennifer A. Dionne
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305,
USA
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AIP Conf. Proc. 1652, 33–43 (2015)
Citation
Justin A. Briggs, Di M. Wu, Ashwin C. Atre, Aitzol Garcia-Etxarri, Jennifer A. Dionne; Upconversion for enhanced photovoltaics. AIP Conf. Proc. 30 March 2015; 1652 (1): 33–43. https://doi.org/10.1063/1.4916166
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