Directed exciton transport highways in organic semiconductors.

Autor: Müller K; Center for Advancing Electronics Dresden, Technische Universität Dresden, 01062, Dresden, Germany.; Institut für Theoretische Physik, Technische Universität Dresden, 01062, Dresden, Germany., Schellhammer KS; Center for Advancing Electronics Dresden, Technische Universität Dresden, 01062, Dresden, Germany.; Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, 01062, Dresden, Germany., Gräßler N; Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, 01062, Dresden, Germany.; Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany., Debnath B; Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany., Liu F; Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany., Krupskaya Y; Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany., Leo K; Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, 01062, Dresden, Germany., Knupfer M; Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany., Ortmann F; Center for Advancing Electronics Dresden, Technische Universität Dresden, 01062, Dresden, Germany. frank.ortmann@tum.de.; Department of Chemistry, TUM School of Natural Sciences, Technische Universität München, Lichtenbergstr. 4, 85748, Garching b. München, Germany. frank.ortmann@tum.de.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Sep 12; Vol. 14 (1), pp. 5599. Date of Electronic Publication: 2023 Sep 12.
DOI: 10.1038/s41467-023-41044-9
Abstrakt: 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.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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