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Strain-activated light-induced halide segregation in mixed-halide perovskite solids

Author

Listed:
  • Yicheng Zhao

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Peng Miao

    (University of Tübingen)

  • Jack Elia

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Huiying Hu

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Xiaoxia Wang

    (Hunan University)

  • Thomas Heumueller

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Yi Hou

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Gebhard J. Matt

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Andres Osvet

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Yu-Ting Chen

    (University of Tübingen)

  • Mariona Tarragó

    (University of Erlangen-Nuremberg)

  • Dominique Ligny

    (University of Erlangen-Nuremberg)

  • Thomas Przybilla

    (Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Peter Denninger

    (Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Johannes Will

    (Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Jiyun Zhang

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
    Helmholtz-Institute Erlangen-Nürnberg (HI-ERN))

  • Xiaofeng Tang

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU))

  • Ning Li

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
    Helmholtz-Institute Erlangen-Nürnberg (HI-ERN))

  • Chenglin He

    (Hunan University)

  • Anlian Pan

    (Hunan University)

  • Alfred J. Meixner

    (University of Tübingen)

  • Erdmann Spiecker

    (Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Dai Zhang

    (University of Tübingen)

  • Christoph J. Brabec

    (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
    Helmholtz-Institute Erlangen-Nürnberg (HI-ERN))

Abstract

Light-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration over approximately 50%. Free-standing single crystals of CH3NH3Pb(I0.65Br0.35)3 (35%Br) do not show halide segregation until uniaxial pressure is applied. Besides, 35%Br single crystals grown on lattice-mismatched substrates (e.g. single-crystal CaF2) show inhomogeneous segregation due to heterogenous strain distribution. Through scanning probe microscopy, the above findings are successfully translated to polycrystalline thin films. For 35%Br thin films, halide segregation selectively occurs at grain boundaries due to localized strain at the boundaries; yet for 65%Br films, halide segregation occurs in the whole layer. We close by demonstrating that only the strain-activated halide segregation (35%Br/45%Br thin films) could be suppressed if the strain is properly released via additives (e.g. KI) or ideal substrates (e.g. SiO2).

Suggested Citation

  • Yicheng Zhao & Peng Miao & Jack Elia & Huiying Hu & Xiaoxia Wang & Thomas Heumueller & Yi Hou & Gebhard J. Matt & Andres Osvet & Yu-Ting Chen & Mariona Tarragó & Dominique Ligny & Thomas Przybilla & P, 2020. "Strain-activated light-induced halide segregation in mixed-halide perovskite solids," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-20066-7
    DOI: 10.1038/s41467-020-20066-7
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    Cited by:

    1. Jin Wen & Yicheng Zhao & Pu Wu & Yuxuan Liu & Xuntian Zheng & Renxing Lin & Sushu Wan & Ke Li & Haowen Luo & Yuxi Tian & Ludong Li & Hairen Tan, 2023. "Heterojunction formed via 3D-to-2D perovskite conversion for photostable wide-bandgap perovskite solar cells," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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