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Rationalizing the light-induced phase separation of mixed halide organic–inorganic perovskites

Author

Listed:
  • Sergiu Draguta

    (University of Notre Dame)

  • Onise Sharia

    (University of Notre Dame)

  • Seog Joon Yoon

    (University of Notre Dame
    University of Notre Dame)

  • Michael C. Brennan

    (University of Notre Dame)

  • Yurii V. Morozov

    (University of Notre Dame)

  • Joseph S. Manser

    (University of Notre Dame
    University of Notre Dame)

  • Prashant V. Kamat

    (University of Notre Dame
    University of Notre Dame
    University of Notre Dame)

  • William F. Schneider

    (University of Notre Dame
    University of Notre Dame)

  • Masaru Kuno

    (University of Notre Dame)

Abstract

Mixed halide hybrid perovskites, CH3NH3Pb(I1−x Br x )3, represent good candidates for low-cost, high efficiency photovoltaic, and light-emitting devices. Their band gaps can be tuned from 1.6 to 2.3 eV, by changing the halide anion identity. Unfortunately, mixed halide perovskites undergo phase separation under illumination. This leads to iodide- and bromide-rich domains along with corresponding changes to the material’s optical/electrical response. Here, using combined spectroscopic measurements and theoretical modeling, we quantitatively rationalize all microscopic processes that occur during phase separation. Our model suggests that the driving force behind phase separation is the bandgap reduction of iodide-rich phases. It additionally explains observed non-linear intensity dependencies, as well as self-limited growth of iodide-rich domains. Most importantly, our model reveals that mixed halide perovskites can be stabilized against phase separation by deliberately engineering carrier diffusion lengths and injected carrier densities.

Suggested Citation

  • Sergiu Draguta & Onise Sharia & Seog Joon Yoon & Michael C. Brennan & Yurii V. Morozov & Joseph S. Manser & Prashant V. Kamat & William F. Schneider & Masaru Kuno, 2017. "Rationalizing the light-induced phase separation of mixed halide organic–inorganic perovskites," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00284-2
    DOI: 10.1038/s41467-017-00284-2
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    Cited by:

    1. Tian Chen & Jiangsheng Xie & Bin Wen & Qixin Yin & Ruohao Lin & Shengcai Zhu & Pingqi Gao, 2023. "Inhibition of defect-induced α-to-δ phase transition for efficient and stable formamidinium perovskite solar cells," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Michael Saliba & Eva Unger & Lioz Etgar & Jingshan Luo & T. Jesper Jacobsson, 2023. "A systematic discrepancy between the short circuit current and the integrated quantum efficiency in perovskite solar cells," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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