Harvesting singlet fission for solar energy conversion via triplet energy transfer

John R. Tritsch, Wai-Lun Chan, Xiaoxi Wu, Nicholas R. Monahan and X-Y. Zhu ()
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John R. Tritsch: Texas Materials Institute, University of Texas
Wai-Lun Chan: Texas Materials Institute, University of Texas
Xiaoxi Wu: Columbia University
Nicholas R. Monahan: Columbia University
X-Y. Zhu: Columbia University

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract The efficiency of a conventional solar cell may be enhanced if one incorporates a molecular material capable of singlet fission, that is, the production of two triplet excitons from the absorption of a single photon. To implement this, we need to successfully harvest the two triplets from the singlet fission material. Here we show in the tetracene (Tc)/copper phthalocyanine (CuPc) model system that triplets produced from singlet fission in the former can transfer to the later on the timescale of 45±5 ps. However, the efficiency of triplet energy transfer is limited by a loss channel due to faster formation (400±100 fs) and recombination (2.6±0.5 ps) of charge transfer excitons at the interface. These findings suggest a design principle for efficient energy harvesting from singlet fission: one must reduce interfacial area between the two organic chromophores to minimize charge transfer/recombination while optimizing light absorption, singlet fission and triplet rather than singlet transfer.

Date: 2013
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DOI: 10.1038/ncomms3679

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