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  Singlet exciton fission via an intermolecular charge transfer state in coevaporated pentacene-perfluoropentacene thin films

Kim, V. O., Broch, K., Belova, V., Chen, Y. S., Gerlach, A., Schreiber, F., et al. (2019). Singlet exciton fission via an intermolecular charge transfer state in coevaporated pentacene-perfluoropentacene thin films. The Journal of Chemical Physics, 151(16): 164706. doi:10.1063/1.5130400.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-7485-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0007-5A5E-C
Genre: Journal Article

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 Creators:
Kim, Vincent O.1, Author
Broch, Katharina2, Author           
Belova, Valentina3, Author
Chen, Y. S.1, Author
Gerlach, Alexander3, Author
Schreiber, Frank3, Author
Tamura, Hiroyuki4, Author
Valle, Raffaele Guido Della5, Author
D’Avino, Gabriele6, Author
Salzmann, Ingo7, Author
Beljonne, David8, Author
Rao, Akshay1, Author
Friend, Richard1, Author
Affiliations:
1Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3Eberhard-Karls Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany, ou_persistent22              
4Department of Chemical System Engineering, The University of Tokyo, Tokyo 113-8656, Japan, ou_persistent22              
5Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna and INSTM-UdR Bologna, Viale Risorgimento 4, 40136 Bologna, Italy, ou_persistent22              
6Institut Néel, CNRS and Grenoble Alpes University, F-38042 Grenoble, France, ou_persistent22              
7Department of Physics, Department of Chemistry and Biochemistry, Centre for Research in Molecular Modeling (CERMM), Centre for NanoScience Research (CeNSR), Concordia University, 7141 Sherbrooke St. West, Montreal, Quebec H4B 1R6, Canada, ou_persistent22              
8Laboratory for Chemistry of Novel Materials, Department of Chemistry, Université de Mons, Place du Parc 20, 7000 Mons, Belgium, ou_persistent22              

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 Abstract: Singlet exciton fission is a spin-allowed process in organic semiconductors by which one absorbed photon generates two triplet excitons. Theory predicts that singlet fission is mediated by intermolecular charge-transfer states in solid-state materials with appropriate singlet-triplet energy spacing, but direct evidence for the involvement of such states in the process has not been provided yet. Here, we report on the observation of subpicosecond singlet fission in mixed films of pentacene and perfluoropentacene. By combining transient spectroscopy measurements to nonadiabatic quantum-dynamics simulations, we show that direct excitation in the charge-transfer absorption band of the mixed films leads to the formation of triplet excitons, unambiguously proving that they act as intermediate states in the fission process.

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Language(s): eng - English
 Dates: 2019-10-032019-10-092019-10-302019-10-28
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.5130400
 Degree: -

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Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: 7 Volume / Issue: 151 (16) Sequence Number: 164706 Start / End Page: - Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226