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| Verfasst von: | Wollscheid, Nikolaus [VerfasserIn]  |
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| | Günther, Benjamin [VerfasserIn] |
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| | Rao, Vaishnavi J. [VerfasserIn] |
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| | Berger, Felix J. [VerfasserIn] |
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| | Pérez Lustres, José Luis [VerfasserIn] |
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| | Motzkus, Marcus [VerfasserIn] |
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| | Zaumseil, Jana [VerfasserIn] |
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| | Gade, Lutz H. [VerfasserIn] |
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| | Höfener, Sebastian [VerfasserIn] |
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| | Buckup, Tiago [VerfasserIn] |
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| Titel: | Ultrafast singlet fission and intersystem crossing in halogenated tetraazaperopyrenes |
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| Verf.angabe: | Nikolaus Wollscheid, Benjamin Günther, Vaishnavi J. Rao, Felix J. Berger, J. Luis Pérez Lustres, Marcus Motzkus, Jana Zaumseil, Lutz H. Gade, Sebastian Höfener, and Tiago Buckup |
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| E-Jahr: | 2020 |
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| Jahr: | September 10, 2020 |
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| Umfang: | 12 S. |
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| Fussnoten: | Gesehen am 04.11.2020 |
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| Titel Quelle: | Enthalten in: The journal of physical chemistry <Washington, DC> / A |
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| Ort Quelle: | Washington, DC : Soc., 1997 |
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| Jahr Quelle: | 2020 |
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| Band/Heft Quelle: | 124(2020), 39, Seite 7857-7868 |
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| ISSN Quelle: | 1520-5215 |
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| Abstract: | Charge carrier multiplication via singlet fission into two triplet states has the potential to increase efficiencies of photovoltaics by one-third due to the reduction of thermalization losses. In the present work, we investigate tetraazaperopyrenes, a class of N-heteropolycyles, as suitable singlet fission candidates. Using a combined experimental and theoretical approach, fundamentally different mechanisms for triplet formation in solution and thin film are identified. In solution, an ultrafast intersystem crossing process is observed, which is accelerated for heavier halide substituents not only due to enhanced spin-orbit coupling but also due to the energy tuning between the S1 and T2 states. In thin films, a correlated triplet pair is formed coherently upon photoexcitation. Subsequently, an excimer formation is observed, which competes with the electronic decorrelation of the triplet pair. The comparison with peropyrene shows that aza-substitutions within the aromatic core can be a powerful strategy for tuning the energy levels of the states important to singlet fission. |
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| DOI: | doi:10.1021/acs.jpca.0c04852 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext: https://doi.org/10.1021/acs.jpca.0c04852 |
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| | DOI: https://doi.org/10.1021/acs.jpca.0c04852 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1737769212 |
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| Verknüpfungen: | → Zeitung |
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Ultrafast singlet fission and intersystem crossing in halogenated tetraazaperopyrenes / Wollscheid, Nikolaus [VerfasserIn]; September 10, 2020 (Online-Ressource)
