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Nat Chem. 2013 Dec;5(12):1019-24. doi: 10.1038/nchem.1801. Epub 2013 Nov 17.

Singlet exciton fission in solution.

Author information

1
Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, UK.

Erratum in

  • Nat Chem. 2013 Dec;5(12). doi: 10.1038/NCHEM.1829.
  • Nat Chem. 2014 Jan;6(1):81.

Abstract

Singlet exciton fission, the spin-conserving process that produces two triplet excited states from one photoexcited singlet state, is a means to circumvent the Shockley-Queisser limit in single-junction solar cells. Although the process through which singlet fission occurs is not well characterized, some local order is thought to be necessary for intermolecular coupling. Here, we report a triplet yield of 200% and triplet formation rates approaching the diffusion limit in solutions of bis(triisopropylsilylethynyl (TIPS)) pentacene. We observe a transient bound excimer intermediate, formed by the collision of one photoexcited and one ground-state TIPS-pentacene molecule. The intermediate breaks up when the two triplets separate to each TIPS-pentacene molecule. This efficient system is a model for future singlet-fission materials and for disordered device components that produce cascades of excited states from sunlight.

PMID:
24256865
DOI:
10.1038/nchem.1801

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