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Real-time observation of the buildup of polaron in α-FAPbI3

Author

Listed:
  • Xingyu Yue

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Chunwei Wang

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    ShanghaiTech University)

  • Bo Zhang

    (Chongqing University)

  • Zeyu Zhang

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zhuang Xiong

    (Chongqing University)

  • Xinzhi Zu

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zhengzheng Liu

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zhiping Hu

    (University of Chinese Academy of Sciences)

  • George Omololu Odunmbaku

    (Chongqing University)

  • Yujie Zheng

    (Chongqing University)

  • Kuan Sun

    (Chongqing University)

  • Juan Du

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

Abstract

The formation of polaron, i.e., the strong coupling process between the carrier and lattice, is considered to play a crucial role in benefiting the photoelectric performance of hybrid organic-inorganic halide perovskites. However, direct observation of the dynamical formation of polarons occurring at time scales within hundreds of femtoseconds remains a technical challenge. Here, by terahertz emission spectroscopy, we demonstrate the real-time observation of polaron formation process in FAPbI3 films. Two different polaron resonances interpreted with the anharmonic coupling emission model have been studied: P1 at ~1 THz relates to the inorganic sublattice vibration mode and the P2 at ~0.4 THz peak relates to the FA+ cation rotation mode. Moreover, P2 could be further strengthened than P1 by pumping the hot carriers to the higher sub-conduction band. Our observations could open a door for THz emission spectroscopy to be a powerful tool in studying polaron formation dynamics in perovskites.

Suggested Citation

  • Xingyu Yue & Chunwei Wang & Bo Zhang & Zeyu Zhang & Zhuang Xiong & Xinzhi Zu & Zhengzheng Liu & Zhiping Hu & George Omololu Odunmbaku & Yujie Zheng & Kuan Sun & Juan Du, 2023. "Real-time observation of the buildup of polaron in α-FAPbI3," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36652-4
    DOI: 10.1038/s41467-023-36652-4
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    References listed on IDEAS

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    1. Myeongkee Park & Amanda J. Neukirch & Sebastian E. Reyes-Lillo & Minliang Lai & Scott R. Ellis & Daniel Dietze & Jeffrey B. Neaton & Peidong Yang & Sergei Tretiak & Richard A. Mathies, 2018. "Excited-state vibrational dynamics toward the polaron in methylammonium lead iodide perovskite," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    2. Xiaojie Liu & Ashish Chanana & Uyen Huynh & Fei Xue & Paul Haney & Steve Blair & Xiaomei Jiang & Z. V. Vardeny, 2020. "Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
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