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Tuning coherent phonon dynamics in two-dimensional phenylethylammonium lead bromide perovskites

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Abstract

Organic-inorganic layered perovskites are two-dimensional quantum well layers in which the layers of lead halide octahedra are stacked between the organic cation layers. The packing geometry of the soft organic molecules and the stiff ionic crystals induce structural deformation of the inorganic octahedra, generating complex lattice dynamics. Especially, the dielectric confinement and ionic sublattice lead to strong coupling between the photogenerated excitons and the phonons from the polar lattice which intensively affects the properties for device applications. The anharmonicity and dynamic disorder from the organic cations participate in the relaxation dynamics coupled with excitations. However, a detailed understanding of this underlying mechanism remains obscure. This work investigates the electron-optical phonon coupling dynamics by employing ultrafast pump-probe transient absorption spectroscopy. The activated different optical phonon modes are observed via systematic studies of (PEA)2PbBr4 perovskite films on the ultrafast lattice vibrational dynamics. The experimental results indicate that solvent engineering has a significant influence on lattice vibrational modes and coherent phonon dynamics. This work provides fresh insights into electron-optical phonon coupling for emergent optoelectronics development based on layered perovskites.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. U1804261, 61627818, 12074104, 11804084, 62075058, and 11827806), Natural Science Foundation of Henan Province (No. 222300420057), the Outstanding Youth Foundation of Henan Normal University (No. 20200171), and the Young Backbone Teacher Training Program in Higher Education of Henan Province (No. 2019GGJS065).

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  1. Minghuan Cui and Chaochao Qin contributed equally to this work.

Authors and Affiliations

  1. Henau Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, Henau Normal University, Xinxiang, 453007, China

    Minghuan Cui, Chaochao Qin, Zhongpo Zhou, Shichen Zhang, Zeye Yuan, Kun Yu & Yufang Liu

  2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China

    Yuanzhi Jiang & Mingjian Yuan

  3. Center for Transformative Science and School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China

    Yuhai Jiang

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  1. Minghuan Cui
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Cui, M., Qin, C., Zhou, Z. et al. Tuning coherent phonon dynamics in two-dimensional phenylethylammonium lead bromide perovskites. Nano Res. 16, 3408–3414 (2023). https://doi.org/10.1007/s12274-022-4911-4

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