4.8 Article

Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites

Journal

NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41467-017-02331-4

Keywords

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Funding

  1. NSF [EFMA-1542747]
  2. Welch Foundation [F-1814]
  3. U.S. Department of Energy [DE-AC36-08-GO28308]
  4. National Center for Photovoltaics - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
  5. Directorate For Engineering
  6. Emerging Frontiers & Multidisciplinary Activities [1542747] Funding Source: National Science Foundation

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Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies. To further improve device performance, it is imperative to obtain fundamental understandings on the photo-response and long-term stability down to the microscopic level. Here, we report the quantitative nanoscale photo-conductivity imaging on two methylammonium lead triiodide thin films with different efficiencies by light-stimulated microwave impedance microscopy. The microwave signals are largely uniform across grains and grain boundaries, suggesting that microstructures do not lead to strong spatial variations of the intrinsic photo-response. In contrast, the measured photoconductivity and lifetime are strongly affected by bulk properties such as the sample crystallinity. As visualized by the spatial evolution of local photoconductivity, the degradation process begins with the disintegration of grains rather than nucleation and propagation from visible boundaries between grains. Our findings provide insights to improve the electro-optical properties of perovskite thin films towards large-scale commercialization.

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