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

Chengsheng Ni, Gordon Hedley, Julia Payne, Vladimir Svrcek, Calum McDonald, Lethy Krishnan Jagadamma, Paul Edwards, Robert Martin, Gunisha Jain, Darragh Carolan, Davide Mariotti, Paul Maguire, Ifor Samuel and John Irvine ()
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Chengsheng Ni: University of St Andrews
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

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00261-9

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