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

Ni, C. et al. (2017) Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters. Nature Communications, 8(1), 170. (doi: 10.1038/s41467-017-00261-9) (PMID:28761100) (PMCID:PMC5537240)

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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.

Item Type:Articles
Additional Information:We thank the Engineering and Physical Sciences Research Council (EPSRC) for funding (EP/K036769/1; EP/K022237/1; EP/M024938/1). C.N. also thanks the support from Fundamental Research Funds for the Central Universities (XDJK2017B033) and Research Funding of Southwest University (20710945). We also thank Dr D. Timmerman for the kind discussion.
Glasgow Author(s) Enlighten ID:Hedley, Dr Gordon
Authors: Ni, C., Hedley, G., Payne, J., Svrcek, V., McDonald, C., Jagadamma, L. K., Edwards, P., Martin, R., Jain, G., Carolan, D., Mariotti, D., Maguire, P., Samuel, I., and Irvine, J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN (Online):2041-1723
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Nature Communications 8:170
Publisher Policy:Reproduced under a Creative Commons License

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