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Proceedings Paper • Open Access

Photochemical upconversion of light for renewable energy and more
Author(s): Timothy W. Schmidt; Rowan W. Macqueen

Paper 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.

Paper Details

Date Published: 4 September 2015
PDF: 8 pages
Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 956202 (4 September 2015); doi: 10.1117/12.2195424
Show Author Affiliations
Timothy W. Schmidt, The Univ. of New South Wales (Australia)
Rowan W. Macqueen, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 9562:
Next Generation Technologies for Solar Energy Conversion VI
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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