Directed exciton transport highways in organic semiconductors

Kai Müller, Karl S. Schellhammer, Nico Gräßler, Bipasha Debnath, Fupin Liu, Yulia Krupskaya, Karl Leo, Martin Knupfer and Frank Ortmann ()
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Kai Müller: Technische Universität Dresden
Karl S. Schellhammer: Technische Universität Dresden
Nico Gräßler: Technische Universität Dresden
Bipasha Debnath: Leibniz Institute for Solid State and Materials Research Dresden
Fupin Liu: Leibniz Institute for Solid State and Materials Research Dresden
Yulia Krupskaya: Leibniz Institute for Solid State and Materials Research Dresden
Karl Leo: Technische Universität Dresden
Martin Knupfer: Leibniz Institute for Solid State and Materials Research Dresden
Frank Ortmann: Technische Universität Dresden

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Exciton bandwidths and exciton transport are difficult to control by material design. We showcase the intriguing excitonic properties in an organic semiconductor material with specifically tailored functional groups, in which extremely broad exciton bands in the near-infrared-visible part of the electromagnetic spectrum are observed by electron energy loss spectroscopy and theoretically explained by a close contact between tightly packing molecules and by their strong interactions. This is induced by the donor–acceptor type molecular structure and its resulting crystal packing, which induces a remarkable anisotropy that should lead to a strongly directed transport of excitons. The observations and detailed understanding of the results yield blueprints for the design of molecular structures in which similar molecular features might be used to further explore the tunability of excitonic bands and pave a way for organic materials with strongly enhanced transport and built-in control of the propagation direction.

Date: 2023
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DOI: 10.1038/s41467-023-41044-9

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