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Facile fabrication of large-grain CH3NH3PbI3−xBrx films for high-efficiency solar cells via CH3NH3Br-selective Ostwald ripening

Author

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  • Mengjin Yang

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Taiyang Zhang

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University)

  • Philip Schulz

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Zhen Li

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Ge Li

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University)

  • Dong Hoe Kim

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Nanjie Guo

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University)

  • Joseph J. Berry

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Kai Zhu

    (Chemistry and Nanoscience Center, National Renewable Energy Laboratory)

  • Yixin Zhao

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University)

Abstract

Organometallic halide perovskite solar cells (PSCs) have shown great promise as a low-cost, high-efficiency photovoltaic technology. Structural and electro-optical properties of the perovskite absorber layer are most critical to device operation characteristics. Here we present a facile fabrication of high-efficiency PSCs based on compact, large-grain, pinhole-free CH3NH3PbI3−xBrx (MAPbI3−xBrx) thin films with high reproducibility. A simple methylammonium bromide (MABr) treatment via spin-coating with a proper MABr concentration converts MAPbI3 thin films with different initial film qualities (for example, grain size and pinholes) to high-quality MAPbI3−xBrx thin films following an Ostwald ripening process, which is strongly affected by MABr concentration and is ineffective when replacing MABr with methylammonium iodide. A higher MABr concentration enhances I–Br anion exchange reaction, yielding poorer device performance. This MABr-selective Ostwald ripening process improves cell efficiency but also enhances device stability and thus represents a simple, promising strategy for further improving PSC performance with higher reproducibility and reliability.

Suggested Citation

  • Mengjin Yang & Taiyang Zhang & Philip Schulz & Zhen Li & Ge Li & Dong Hoe Kim & Nanjie Guo & Joseph J. Berry & Kai Zhu & Yixin Zhao, 2016. "Facile fabrication of large-grain CH3NH3PbI3−xBrx films for high-efficiency solar cells via CH3NH3Br-selective Ostwald ripening," Nature Communications, Nature, vol. 7(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12305
    DOI: 10.1038/ncomms12305
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