Photochemical upconversion of light for renewable energy and more

Timothy W. Schmidt; Rowan W. Macqueen

doi:10.1117/12.2195424

4 September 2015 Photochemical upconversion of light for renewable energy and more

Timothy W. Schmidt, Rowan W. Macqueen

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Proceedings Volume 9562, Next Generation Technologies for Solar Energy Conversion VI; 956202 (2015) https://doi.org/10.1117/12.2195424
Event: SPIE Optics + Photonics for Sustainable Energy, 2015, San Diego, California, United States

Abstract

Photochemical upconversion has been put forward as a candidate technology to improve the light-harvesting capabilities of thin-film photovoltaic cells, by harvesting transmitted sub-bandgap light and re-radiating the absorbed energy at a usable wavelength. Efficiencies of 10% have been observed under solar-level irradiation, and up to 86% (quantum yield of 43%) has been observed under strong irradiance. In this proceeding, we explain the triplet-triplet annihilation mechanism underlying photochemical upconversion and delve into the chemical kinetics to extract strategies to improve device performance. We suggest that one of these strategies, concentrating the sensitizer species, may be flawed without proper consideration of the sensitizer identity, due to enhanced emitter triplet decay caused by the external heavy atom effect.

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Timothy W. Schmidt and Rowan W. Macqueen "Photochemical upconversion of light for renewable energy and more", Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 956202 (4 September 2015); https://doi.org/10.1117/12.2195424

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KEYWORDS

Upconversion

Nanoparticles

Chemical species

Molecules

Quantum efficiency

Renewable energy

Solar energy

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