Identifying triplet pathways in dilute pentacene films

Daphné Lubert-Perquel, Enrico Salvadori (), Matthew Dyson, Paul N. Stavrinou, Riccardo Montis, Hiroki Nagashima, Yasuhiro Kobori, Sandrine Heutz () and Christopher W. M. Kay ()
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Daphné Lubert-Perquel: Imperial College London
Enrico Salvadori: Queen Mary University of London
Matthew Dyson: Imperial College London
Paul N. Stavrinou: Oxford University
Riccardo Montis: Imperial College London
Hiroki Nagashima: Kobe University
Yasuhiro Kobori: Kobe University
Sandrine Heutz: Imperial College London
Christopher W. M. Kay: University College London

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Building efficient triplet-harvesting layers for photovoltaic applications requires a deep understanding of the microscopic properties of the components involved and their dynamics. Singlet fission is a particularly appealing mechanism as it generates two excitons from a single photon. However, the pathways of the coupled triplets into free species, and their dependence on the intermolecular geometry, has not been fully explored. In this work, we produce highly ordered dilute pentacene films with distinct parallel and herringbone dimers and aggregates. Using electron paramagnetic resonance spectroscopy, we provide compelling evidence for the formation of distinct quintet excitons in ambient conditions, with intrinsically distinctive electronic and kinetic properties. We find that the ability of quintets to separate into free triplets is promoted in the parallel dimers and this provides molecular design rules to control the triplets, favouring either enhanced photovoltaic efficiency (parallel) or strongly bound pairs that could be exploited for logic applications (herringbone).

Date: 2018
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DOI: 10.1038/s41467-018-06330-x

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