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Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters

Author

Listed:
  • Chengsheng Ni

    (University of St Andrews
    Southwest University)

  • Gordon Hedley

    (University of St Andrews)

  • Julia Payne

    (University of St Andrews)

  • Vladimir Svrcek

    (Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology (AIST))

  • Calum McDonald

    (Ulster University)

  • Lethy Krishnan Jagadamma

    (University of St Andrews)

  • Paul Edwards

    (University of Strathclyde)

  • Robert Martin

    (University of Strathclyde)

  • Gunisha Jain

    (Ulster University)

  • Darragh Carolan

    (Ulster University)

  • Davide Mariotti

    (Ulster University)

  • Paul Maguire

    (Ulster University)

  • Ifor Samuel

    (University of St Andrews)

  • John Irvine

    (University of St Andrews
    Chinese Academy of Sciences)

Abstract

A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal–organic hybrid materials, a highly orientated film of (CH3NH3)3Bi2I9 with nanometre-sized core clusters of Bi2I9 3− surrounded by insulating CH3NH3 + was prepared via solution processing. The (CH3NH3)3Bi2I9 film shows highly anisotropic photoluminescence emission and excitation due to the large proportion of localised excitons coupled with delocalised excitons from intercluster energy transfer. The abrupt increase in photoluminescence quantum yield at excitation energy above twice band gap could indicate a quantum cutting due to the low dimensionality.

Suggested Citation

  • Chengsheng Ni & Gordon Hedley & Julia Payne & Vladimir Svrcek & Calum McDonald & Lethy Krishnan Jagadamma & Paul Edwards & Robert Martin & Gunisha Jain & Darragh Carolan & Davide Mariotti & Paul Magui, 2017. "Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00261-9
    DOI: 10.1038/s41467-017-00261-9
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