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Proceedings Paper

Radiative cooling for concentrating photovoltaics (Conference Presentation)
Author(s): Peter Bermel

Paper Abstract

Radiative cooling is a uniquely compact and passive cooling mechanism. Significant applications can be found in energy generation, particularly concentrating photovoltaics (CPV) and thermophotovoltaics (TPV). Both rely on low-bandgap PV cells that experience significant reductions in performance and lifetime when operating at elevated temperatures. This issue creates a significant barrier to widespread adoption. To address this challenge, we demonstrate enhanced radiative cooling for low-bandgap PV cells under concentrated sunlight for the first time. A composite material stack is used as the radiative cooler. Enhanced radiative cooling reduces operating temperatures by 10 degrees C, translating into a relative increase of 5.7% in open-circuit voltage and an estimated increase of 40% in lifetime at 13 suns. Using a model, we also estimate the same setup could achieve an improvement of 34% in open-circuit voltage for 35 suns, which could reduce levelized costs of energy up to 33% for high activation energy failure modes. The radiative cooling enhancement demonstrated here is a simple and straightforward approach, which can be generalized to other optoelectronic systems.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11121, New Concepts in Solar and Thermal Radiation Conversion II, 1112109 (9 September 2019); doi: 10.1117/12.2532033
Show Author Affiliations
Peter Bermel, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 11121:
New Concepts in Solar and Thermal Radiation Conversion II
Jeremy N. Munday; Peter Bermel, Editor(s)

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