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Ba-induced phase segregation and band gap reduction in mixed-halide inorganic perovskite solar cells

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  • Wanchun Xiang

    (Wuhan University of Technology
    Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Zaiwei Wang

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Dominik J. Kubicki

    (Ecole Polytechnique Fedérale de Lausanne (EPFL)
    Ecole Polytechnique Fedérale de Lausanne (EPFL)
    Cavendish Laboratory)

  • Xueting Wang

    (Jilin University)

  • Wolfgang Tress

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Jingshan Luo

    (Ecole Polytechnique Fedérale de Lausanne (EPFL)
    Nankai University)

  • Jiahuan Zhang

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Albert Hofstetter

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Lijun Zhang

    (Jilin University)

  • Lyndon Emsley

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Michael Grätzel

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

  • Anders Hagfeldt

    (Ecole Polytechnique Fedérale de Lausanne (EPFL))

Abstract

All-inorganic metal halide perovskites are showing promising development towards efficient long-term stable materials and solar cells. Element doping, especially on the lead site, has been proved to be a useful strategy to obtain the desired film quality and material phase for high efficient and stable inorganic perovskite solar cells. Here we demonstrate a function by adding barium in CsPbI2Br. We find that barium is not incorporated into the perovskite lattice but induces phase segregation, resulting in a change in the iodide/bromide ratio compared with the precursor stoichiometry and consequently a reduction in the band gap energy of the perovskite phase. The device with 20 mol% barium shows a high power conversion efficiency of 14.0% and a great suppression of non-radiative recombination within the inorganic perovskite, yielding a high open-circuit voltage of 1.33 V and an external quantum efficiency of electroluminescence of 10−4.

Suggested Citation

  • Wanchun Xiang & Zaiwei Wang & Dominik J. Kubicki & Xueting Wang & Wolfgang Tress & Jingshan Luo & Jiahuan Zhang & Albert Hofstetter & Lijun Zhang & Lyndon Emsley & Michael Grätzel & Anders Hagfeldt, 2019. "Ba-induced phase segregation and band gap reduction in mixed-halide inorganic perovskite solar cells," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12678-5
    DOI: 10.1038/s41467-019-12678-5
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