Spin fine-structure reveals bi-exciton geometry in an organic semiconductor
| Autor: | K. M. Yunusova, Thierry Chanelière, John E. Anthony, Alexei D. Chepelianskii, V. Derkach, Leah R. Weiss, Sam L. Bayliss |
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| Přispěvatelé: | Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Nanophysique et Semiconducteurs (NPSC), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire Aimé Cotton (LAC), Usikov's Institute for Radiophysics and Electronics, University of Kentucky, Cavendish Laboratory, University of Cambridge [UK] (CAM) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Exciton
General Physics and Astronomy FOS: Physical sciences Geometry Spin structure 7. Clean energy 01 natural sciences Crystal Condensed Matter::Materials Science 0103 physical sciences 010306 general physics Biexciton ComputingMilieux_MISCELLANEOUS [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] Spin-½ Physics Condensed Matter::Quantum Gases Condensed Matter - Materials Science Quantum Physics Annihilation Condensed Matter::Other Materials Science (cond-mat.mtrl-sci) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Organic semiconductor Multiple exciton generation [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Quantum Physics (quant-ph) |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2020, 125 (9), pp.097402. ⟨10.1103/PhysRevLett.125.097402⟩ |
| ISSN: | 0031-9007 1079-7114 |
| Popis: | International audience; In organic semiconductors, bi-exciton states are key intermediates in carrier-multiplication and exciton annihilation. Of particular recent interest is the spin-2 (quintet) bi-exciton. Comprised of two triplet excitons, the bi-exciton can be formed by singlet fission (the formation of two triplet excitons from one singlet state) or by triplet-triplet annihilation (the reverse process). Of interest for photovoltaics and photocatalysis, the wavefunction of these optically dark bi-excitons is difficult to probe and predict. However, the local geometry of the pair-state is imprinted in the fine structure of its spin Hamiltonian. To access the fine structure of the quintet-state we develop and deploy broadband optically detected magnetic resonance (0-9 GHz). Here we correlate the experimentally extracted spin structure with the molecular crystal structure to identify the specific molecular pairings on which the bi-exciton state resides. |
| Databáze: | OpenAIRE |
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