Enhanced photovoltaic energy conversion using thermally based spectral shaping

David M. Bierman, Andrej Lenert, Walker R. Chan, Bikram Bhatia, Ivan Celanović, Marin Soljačić and Evelyn N. Wang ()
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David M. Bierman: Device Research Laboratory, Massachusetts Institute of Technology
Andrej Lenert: Device Research Laboratory, Massachusetts Institute of Technology
Walker R. Chan: Research Laboratory of Electronics, Massachusetts Institute of Technology
Bikram Bhatia: Device Research Laboratory, Massachusetts Institute of Technology
Ivan Celanović: Institute for Soldier Nanotechnology, Massachusetts Institute of Technology
Marin Soljačić: Research Laboratory of Electronics, Massachusetts Institute of Technology
Evelyn N. Wang: Device Research Laboratory, Massachusetts Institute of Technology

Nature Energy, 2016, vol. 1, issue 6, 1-7

Abstract: Abstract Solar thermophotovoltaic devices have the potential to enhance the performance of solar energy harvesting by converting broadband sunlight to narrow-band thermal radiation tuned for a photovoltaic cell. A direct comparison of the operation of a photovoltaic with and without a spectral converter is the most critical indicator of the promise of this technology. Here, we demonstrate enhanced device performance through the suppression of 80% of unconvertible photons by pairing a one-dimensional photonic crystal selective emitter with a tandem plasma–interference optical filter. We measured a solar-to-electrical conversion rate of 6.8%, exceeding the performance of the photovoltaic cell alone. The device operates more efficiently while reducing the heat generation rates in the photovoltaic cell by a factor of two at matching output power densities. We determined the theoretical limits, and discuss the implications of surpassing the Shockley–Queisser limit. Improving the performance of an unaltered photovoltaic cell provides an important framework for the design of high-efficiency solar energy converters.

Date: 2016
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DOI: 10.1038/nenergy.2016.68

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