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Direct observation of intrinsic twin domains in tetragonal CH3NH3PbI3

Author

Listed:
  • Mathias Uller Rothmann

    (Monash University)

  • Wei Li

    (Monash University)

  • Ye Zhu

    (Monash University)

  • Udo Bach

    (Monash University
    Commonwealth Scientific and Industrial Research Organization, Manufacturing Flagship
    Melbourne Centre for Nano Fabrication)

  • Leone Spiccia

    (School of Chemistry, Monash University)

  • Joanne Etheridge

    (Monash University
    Monash Centre for Electron Microscopy, Monash University)

  • Yi-Bing Cheng

    (Monash University
    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology)

Abstract

Organic–inorganic hybrid perovskites are exciting candidates for next-generation solar cells, with CH3NH3PbI3 being one of the most widely studied. While there have been intense efforts to fabricate and optimize photovoltaic devices using CH3NH3PbI3, critical questions remain regarding the crystal structure that governs its unique properties of the hybrid perovskite material. Here we report unambiguous evidence for crystallographic twin domains in tetragonal CH3NH3PbI3, observed using low-dose transmission electron microscopy and selected area electron diffraction. The domains are around 100–300 nm wide, which disappear/reappear above/below the tetragonal-to-cubic phase transition temperature (approximate 57 °C) in a reversible process that often ‘memorizes’ the scale and orientation of the domains. Since these domains exist within the operational temperature range of solar cells, and have dimensions comparable to the thickness of typical CH3NH3PbI3 films in the solar cells, understanding the twin geometry and orientation is essential for further improving perovskite solar cells.

Suggested Citation

  • Mathias Uller Rothmann & Wei Li & Ye Zhu & Udo Bach & Leone Spiccia & Joanne Etheridge & Yi-Bing Cheng, 2017. "Direct observation of intrinsic twin domains in tetragonal CH3NH3PbI3," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14547
    DOI: 10.1038/ncomms14547
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    Cited by:

    1. Wei Qin & Wajid Ali & Jianfeng Wang & Yong Liu & Xiaolan Yan & Pengfei Zhang & Zhaochi Feng & Hao Tian & Yanfeng Yin & Wenming Tian & Can Li, 2023. "Suppressing non-radiative recombination in metal halide perovskite solar cells by synergistic effect of ferroelasticity," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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