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Issue 1, 2017
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Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells

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Abstract

Here we report the investigation of controlled PbI2 secondary phase formation in CH3NH3PbI3 (MAPI) photovoltaics through post-deposition thermal annealing, highlighting the beneficial role of PbI2 on device performance. Using high-resolution transmission electron microscopy we show the location of PbI2 within the active layer and propose a nucleation and growth mechanism. We discover that during the annealing that PbI2 forms mainly in the grain boundary regions of the MAPI films and that at certain temperatures the PbI2 formed can be highly beneficial to device performance – reducing current–voltage hysteresis and increasing the power conversion efficiency. Our analysis shows that the MAPI grain boundaries as susceptible areas that, under thermal loading, initiate the conversion of MAPI into PbI2.

Graphical abstract: Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells

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Publication details

The article was received on 31 Oct 2016, accepted on 19 Jan 2017 and first published on 24 Jan 2017


Article type: Paper
DOI: 10.1039/C6SE00029K
Citation: Sustainable Energy Fuels, 2017,1, 119-126
  • Open access: Creative Commons BY license
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    Formation, location and beneficial role of PbI2 in lead halide perovskite solar cells

    T. Du, C. H. Burgess, J. Kim, J. Zhang, J. R. Durrant and M. A. McLachlan, Sustainable Energy Fuels, 2017, 1, 119
    DOI: 10.1039/C6SE00029K

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