From Event: SPIE Optics + Photonics for Sustainable Energy, 2015
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.
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 (Presented at SPIE Optics + Photonics for Sustainable Energy: August 10, 2015; Published: 4 September 2015); https://doi.org/10.1117/12.2195424.
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