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Photo-induced halide redistribution in organic–inorganic perovskite films

Author

Listed:
  • Dane W. deQuilettes

    (University of Washington)

  • Wei Zhang

    (University of Oxford
    Present address: School of Chemistry, University of Lincoln, Beevor Street, Lincoln LN6 7DL, UK.)

  • Victor M. Burlakov

    (University of Oxford
    Mathematical Institute, OCCAM, Woodstock Road, University of Oxford)

  • Daniel J. Graham

    (University of Washington)

  • Tomas Leijtens

    (University of Oxford)

  • Anna Osherov

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Vladimir Bulović

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Henry J. Snaith

    (University of Oxford)

  • David S. Ginger

    (University of Washington)

  • Samuel D. Stranks

    (Research Laboratory of Electronics, Massachusetts Institute of Technology
    Cavendish Laboratory)

Abstract

Organic–inorganic perovskites such as CH3NH3PbI3 are promising materials for a variety of optoelectronic applications, with certified power conversion efficiencies in solar cells already exceeding 21%. Nevertheless, state-of-the-art films still contain performance-limiting non-radiative recombination sites and exhibit a range of complex dynamic phenomena under illumination that remain poorly understood. Here we use a unique combination of confocal photoluminescence (PL) microscopy and chemical imaging to correlate the local changes in photophysics with composition in CH3NH3PbI3 films under illumination. We demonstrate that the photo-induced ‘brightening’ of the perovskite PL can be attributed to an order-of-magnitude reduction in trap state density. By imaging the same regions with time-of-flight secondary-ion-mass spectrometry, we correlate this photobrightening with a net migration of iodine. Our work provides visual evidence for photo-induced halide migration in triiodide perovskites and reveals the complex interplay between charge carrier populations, electronic traps and mobile halides that collectively impact optoelectronic performance.

Suggested Citation

  • Dane W. deQuilettes & Wei Zhang & Victor M. Burlakov & Daniel J. Graham & Tomas Leijtens & Anna Osherov & Vladimir Bulović & Henry J. Snaith & David S. Ginger & Samuel D. Stranks, 2016. "Photo-induced halide redistribution in organic–inorganic perovskite films," Nature Communications, Nature, vol. 7(1), pages 1-9, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11683
    DOI: 10.1038/ncomms11683
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