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Proceedings Paper

Molecular approaches to third generation photovoltaics: photochemical up-conversion
Author(s): Yuen Yap Cheng; Burkhard Fückel; Derrick A. Roberts; Tony Khoury; Raphaël G. C. R. Clady; Murad J. Y. Tayebjee; Roland Piper; N. J. Ekins-Daukes; Maxwell J. Crossley; Timothy W. Schmidt
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Paper Abstract

We have investigated a photochemical up-conversion system comprising a molecular mixture of a palladium porphyrin to harvest light, and a polycyclic aromatic hydrocarbon to emit light. The energy of harvested photons is stored as molecular triplet states which then annihilate to bring about up-converted fluorescence. The limiting efficiency of such triplet-triplet annihilation up-conversion has been believed to be 11% for some time. However, by rigorously investigating the kinetics of delayed fluorescence following pulsed excitation, we demonstrate instantaneous annihilation efficiencies exceeding 40%, and limiting efficiencies for the current system of ≈60%. We attribute the high efficiencies obtained to the electronic structure of the emitting molecule, which exhibits an exceptionally high T2 molecular state. We utilize the kinetic data obtained to model an up-converting layer irradiated with broadband sunlight, finding that ≈3% efficiencies can be obtained with the current system, with this improving dramatically upon optimization of various parameters.

Paper Details

Date Published: 24 August 2010
PDF: 10 pages
Proc. SPIE 7772, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion, 777207 (24 August 2010); doi: 10.1117/12.862739
Show Author Affiliations
Yuen Yap Cheng, The Univ. of Sydney (Australia)
Burkhard Fückel, The Univ. of Sydney (Australia)
Derrick A. Roberts, The Univ. of Sydney (Australia)
Tony Khoury, The Univ. of Sydney (Australia)
Raphaël G. C. R. Clady, The Univ. of Sydney (Australia)
Murad J. Y. Tayebjee, The Univ. of Sydney (Australia)
Roland Piper, Imperial College London (United Kingdom)
N. J. Ekins-Daukes, Imperial College London (United Kingdom)
Maxwell J. Crossley, The Univ. of Sydney (Australia)
Timothy W. Schmidt, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 7772:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion
Loucas Tsakalakos, Editor(s)

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