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Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy

Author

Listed:
  • Jiaxin Pan

    (Imperial College London)

  • Ziming Chen

    (Imperial College London)

  • Tiankai Zhang

    (Linköping University)

  • Beier Hu

    (Imperial College London)

  • Haoqing Ning

    (Imperial College London)

  • Zhu Meng

    (Imperial College London)

  • Ziyu Su

    (Imperial College London)

  • Davide Nodari

    (Imperial College London)

  • Weidong Xu

    (Imperial College London)

  • Ganghong Min

    (Imperial College London)

  • Mengyun Chen

    (Linköping University)

  • Xianjie Liu

    (Linköping University)

  • Nicola Gasparini

    (Imperial College London)

  • Saif A. Haque

    (Imperial College London)

  • Piers R. F. Barnes

    (Imperial College London)

  • Feng Gao

    (Linköping University)

  • Artem A. Bakulin

    (Imperial College London)

Abstract

Conventional spectroscopies are not sufficiently selective to comprehensively understand the behaviour of trapped carriers in perovskite solar cells, particularly under their working conditions. Here we use infrared optical activation spectroscopy (i.e., pump-push-photocurrent), to observe the properties and real-time dynamics of trapped carriers within operando perovskite solar cells. We compare behaviour differences of trapped holes in pristine and surface-passivated FA0.99Cs0.01PbI3 devices using a combination of quasi-steady-state and nanosecond time-resolved pump-push-photocurrent, as well as kinetic and drift-diffusion models. We find a two-step trap-filling process: the rapid filling (~10 ns) of low-density traps in the bulk of perovskite, followed by the slower filling (~100 ns) of high-density traps at the perovskite/hole transport material interface. Surface passivation by n-octylammonium iodide dramatically reduces the number of trap states (~50 times), improving the device performance substantially. Moreover, the activation energy (~280 meV) of the dominant hole traps remains similar with and without surface passivation.

Suggested Citation

  • Jiaxin Pan & Ziming Chen & Tiankai Zhang & Beier Hu & Haoqing Ning & Zhu Meng & Ziyu Su & Davide Nodari & Weidong Xu & Ganghong Min & Mengyun Chen & Xianjie Liu & Nicola Gasparini & Saif A. Haque & Pi, 2023. "Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43852-5
    DOI: 10.1038/s41467-023-43852-5
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    References listed on IDEAS

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    1. James M. Ball & Annamaria Petrozza, 2016. "Defects in perovskite-halides and their effects in solar cells," Nature Energy, Nature, vol. 1(11), pages 1-13, November.
    2. Renjun Guo & Dan Han & Wei Chen & Linjie Dai & Kangyu Ji & Qiu Xiong & Saisai Li & Lennart K. Reb & Manuel A. Scheel & Shambhavi Pratap & Nian Li & Shanshan Yin & Tianxiao Xiao & Suzhe Liang & Anna Le, 2021. "Degradation mechanisms of perovskite solar cells under vacuum and one atmosphere of nitrogen," Nature Energy, Nature, vol. 6(10), pages 977-986, October.
    3. Xuejian Ma & Fei Zhang & Zhaodong Chu & Ji Hao & Xihan Chen & Jiamin Quan & Zhiyuan Huang & Xiaoming Wang & Xiaoqin Li & Yanfa Yan & Kai Zhu & Keji Lai, 2021. "Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
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