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Issue 44, 2016
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Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals

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Abstract

Understanding the influence of light on ion migration in organic–inorganic halide perovskite (OIHP) materials is important to understand the photostability of perovskite solar cells. We reveal that light could greatly reduce the ion migration energy barrier in both polycrystalline and single crystalline OIHP. The activation energies derived from conductivity measurement under 0.25 Sun decrease to less than one half of the values in the dark. A typical ion drift velocity in CH3NH3PbI3 polycrystalline films is 1.2 μm s−1 under 1 Sun, compared with 0.016 μm s−1 under 0.02 Sun. Ion migration across the photoactive layers in most OIHP devices thus takes only subseconds under 1 Sun illumination, which is much shorter than what it was thought to take. Most important of all, ion migration through a single crystal surface is still too slow to be observed even after illumination for two days due to the large ion diffusion activation energy, >0.38 eV.

Graphical abstract: Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals

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Publication details

The article was received on 21 Sep 2016, accepted on 13 Oct 2016, published on 13 Oct 2016 and first published online on 13 Oct 2016


Article type: Paper
DOI: 10.1039/C6CP06496E
Citation: Phys. Chem. Chem. Phys., 2016,18, 30484-30490
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    Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals

    J. Xing, Q. Wang, Q. Dong, Y. Yuan, Y. Fang and J. Huang, Phys. Chem. Chem. Phys., 2016, 18, 30484
    DOI: 10.1039/C6CP06496E

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