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Proceedings Paper

Nanostructured upconverters for improved solar cell performance
Author(s): Rowan W. MacQueen; Tim F. Schulze; Tony Khoury; Yuen Yap Cheng; Bernd Stannowski; Klaus Lips; Maxwel J. Crossley; Timothy Schmidt
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Paper Abstract

Triplet-triplet annihilation photon upconversion (TTA-UC) is a promising candidate for mitigating sub-band gap absorption losses in solar cells. In TTA-UC, sensitiser dyes absorb sub-band gap photons, cross to a triplet state, and transfer triplet excitons to emitter dyes. Two triplet-excited emitters can undergo TTA, raising one emitter to a higher-energy bright singlet state. The quadratic efficiency of TTA-UC at device-relevant light intensities motivates a push towards the higher chromophore densities achievable in the solid phase. We have begun this process by tethering tetrakisquinoxalino palladium porphyrin to 20nm silica nanoparticles using peptide chemistry techniques, achieving a total-volume concentration of 1.5mM. The phosphorescence kinetics of the tethered porphyrins was measured to quantify quenching by rubrene emitter. Upconverter performance was measured in a solar cell enhancement experiment.

Paper Details

Date Published: 25 September 2013
PDF: 9 pages
Proc. SPIE 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV, 882408 (25 September 2013); doi: 10.1117/12.2026907
Show Author Affiliations
Rowan W. MacQueen, The Univ. of Sydney (Australia)
Tim F. Schulze, Helmholtz-Zentrum Berlin (Germany)
Tony Khoury, Lebanese Univ. (Lebanon)
Yuen Yap Cheng, The Univ. of Sydney (Australia)
Bernd Stannowski, Helmholtz-Zentrum Berlin (Germany)
Klaus Lips, Helmholtz-Zentrum Berlin (Germany)
Maxwel J. Crossley, The Univ. of Sydney (Australia)
Timothy Schmidt, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 8824:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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