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

Wanchun Xiang (), Zaiwei Wang, Dominik J. Kubicki, Xueting Wang, Wolfgang Tress, Jingshan Luo, Jiahuan Zhang, Albert Hofstetter, Lijun Zhang, Lyndon Emsley, Michael Grätzel and Anders Hagfeldt ()
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Wanchun Xiang: Wuhan University of Technology
Zaiwei Wang: Ecole Polytechnique Fedérale de Lausanne (EPFL)
Dominik J. Kubicki: Ecole Polytechnique Fedérale de Lausanne (EPFL)
Xueting Wang: Jilin University
Wolfgang Tress: Ecole Polytechnique Fedérale de Lausanne (EPFL)
Jingshan Luo: Ecole Polytechnique Fedérale de Lausanne (EPFL)
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)

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-12678-5

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