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Optically Induced Coherent Phonons in Bismuth Oxyiodide (BiOI) Nanoplatelets
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    Optically Induced Coherent Phonons in Bismuth Oxyiodide (BiOI) Nanoplatelets
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    • Sebastian Rieger
      Sebastian Rieger
      Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany
    • Tim Fürmann
      Tim Fürmann
      Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany
      More by Tim Fürmann
    • Jacek K. Stolarczyk*
      Jacek K. Stolarczyk
      Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany
      *Email for J.K.S.: [email protected]
    • Jochen Feldmann*
      Jochen Feldmann
      Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany
      *Email for J.F.: [email protected]
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    Nano Letters

    Cite this: Nano Lett. 2021, 21, 18, 7887–7893
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    https://doi.org/10.1021/acs.nanolett.1c00530
    Published June 30, 2021
    Copyright © 2021 The Authors. Published by American Chemical Society

    Abstract

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    Bismuth oxyiodide (BiOI) is a promising material for photocatalysis combining intriguing optical and structural properties. We show that excitation by a femtosecond laser pulse creates coherent phonons inducing a time-variant oscillating modulation of the optical density. We find that the two underlying frequencies originate from lattice vibrations along the [001] crystallographic axis, the stacking direction of oppositely charged layers in BiOI. This is consistent with a subpicosecond charge separation driven by a built-in dipolar field. This partially screens the field, launching coherent phonons. Further, we determine the two major dephasing mechanisms that lead to the loss of vibronic coherence: (i) the anharmonic decay of an optical phonon into two acoustic phonons and (ii) phonon-carrier scattering. Our results provide a direct demonstration of the presence of an electric field in BiOI along the [001] axis and show its role in efficient charge separation that is crucial for photocatalytic applications of BiOI.

    Copyright © 2021 The Authors. Published by American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.1c00530.

    • BiOI synthesis, experimental setup for time-integrated and time-resolved spectroscopy, discussion on the anharmonic decay of phonons, supporting figures of the heat map of differential optical density versus time, differential optical density spectrum at 300 nm excitation, oscillatory modulation of the optical density illustrating the cosine nature, crystal structure with highlighted direction of the built-in dipolar electric field and transients at different energies, and phonon dispersion relation (PDF)

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    Cited By

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    This article is cited by 12 publications.

    1. Julian G. Mann, Fei He, Quinten A. Akkerman, Tushar Debnath, Jochen Feldmann. A Bound Exciton Resonance Modulated by Bulk and Localized Coherent Phonons in Double Perovskites. The Journal of Physical Chemistry Letters 2024, 15 (8) , 2169-2176. https://doi.org/10.1021/acs.jpclett.3c03443
    2. Hsueh Han Yang, Kang-Yu Hsiao, Fu-Yu Liu, Chiing-Chang Chen, I-Chia Chen. Vibrational Structures of Iodine-Vacancy Bismuth Oxyiodides Using Temperature-Dependent Low-Wavenumber Raman Spectroscopy. The Journal of Physical Chemistry C 2024, 128 (1) , 563-570. https://doi.org/10.1021/acs.jpcc.3c06627
    3. Snigdha Lal, Marcello Righetto, Aleksander M. Ulatowski, Silvia G. Motti, Zhuotong Sun, Judith L. MacManus-Driscoll, Robert L. Z. Hoye, Laura M. Herz. Bandlike Transport and Charge-Carrier Dynamics in BiOI Films. The Journal of Physical Chemistry Letters 2023, 14 (29) , 6620-6629. https://doi.org/10.1021/acs.jpclett.3c01520
    4. Junying Liu, Sanjay Jatav, Patrick Wessel, Eric H. Hill. Templating Unidirectional Bismuth Oxyiodide Crystal Growth with Layered Silicates for Enhanced Photocatalysis. The Journal of Physical Chemistry C 2022, 126 (10) , 4975-4983. https://doi.org/10.1021/acs.jpcc.1c10853
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    11. Yuan Wang, Xuemei Liu, Quyun Chen, Tian C. Zhang, Like Ouyang, Shaojun Yuan. Simultaneous photocatalytic oxidation and adsorption for efficient As(III) removal by magnetic BiOI/γ-Fe2O3 core–shell nanoparticles. Materials Today Chemistry 2022, 24 , 100823. https://doi.org/10.1016/j.mtchem.2022.100823
    12. Pingping Teng, Zhiang Li, Shuai Gao, Kang Li, Nigel Copner, Liu Zhihai, Xinghua Yang. Flexible PAN-BiOI-AgI heterojunction nanofiber and the photocatalytic degradation property. Optical Materials Express 2022, 12 (3) , 1031. https://doi.org/10.1364/OME.450592

    Nano Letters

    Cite this: Nano Lett. 2021, 21, 18, 7887–7893
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.1c00530
    Published June 30, 2021
    Copyright © 2021 The Authors. Published by American Chemical Society

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