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Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield

Author

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  • Peter J. Budden

    (Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue)

  • Leah R. Weiss

    (Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue
    Pritzker School of Molecular Engineering, University of Chicago)

  • Matthias Müller

    (Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270)

  • Naitik A. Panjwani

    (Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin)

  • Simon Dowland

    (Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue)

  • Jesse R. Allardice

    (Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue)

  • Michael Ganschow

    (Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270)

  • Jan Freudenberg

    (Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270)

  • Jan Behrends

    (Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin)

  • Uwe H. F. Bunz

    (Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270)

  • Richard H. Friend

    (Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue)

Abstract

We report a fully efficient singlet exciton fission material with high ambient chemical stability. 10,21-Bis(triisopropylsilylethynyl)tetrabenzo[a,c,l,n]pentacene (TTBP) combines an acene core with triphenylene wings that protect the formal pentacene from chemical degradation. The electronic energy levels position singlet exciton fission to be endothermic, similar to tetracene despite the triphenylenes. TTBP exhibits rapid early time singlet fission with quantitative yield of triplet pairs within 100 ps followed by thermally activated separation to free triplet excitons over 65 ns. TTBP exhibits high photoluminescence quantum efficiency, close to 100% when dilute and 20% for solid films, arising from triplet-triplet annihilation. In using such a system for exciton multiplication in a solar cell, maximum thermodynamic performance requires radiative decay of the triplet population, observed here as emission from the singlet formed by recombination of triplet pairs. Combining chemical stabilisation with efficient endothermic fission provides a promising avenue towards singlet fission materials for use in photovoltaics.

Suggested Citation

  • Peter J. Budden & Leah R. Weiss & Matthias Müller & Naitik A. Panjwani & Simon Dowland & Jesse R. Allardice & Michael Ganschow & Jan Freudenberg & Jan Behrends & Uwe H. F. Bunz & Richard H. Friend, 2021. "Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21719-x
    DOI: 10.1038/s41467-021-21719-x
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