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

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 Bi2I93- 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.Understanding the confinement and transport of excitons in low dimensional systems will aid the development of next generation photovoltaics. Via photophysical studies Ni et al. observe 'quantum cutting' in 0D metal-organic hybrid materials based on methylammonium bismuth halide (CH3NH3)3Bi2I9.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ni C,Hedley G,Payne J,Svrcek V,McDonald C,Jagadamma LK,Edwards P,Martin R,Jain G,Carolan D,Mariotti D,Maguire P,Samuel I,Irvine J

doi

10.1038/s41467-017-00261-9

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

170

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00261-9

journal_volume

8

pub_type

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