Charge carrier localised in zero-dimensional (CH3NH3)3Bi219 clusters

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.

Citation

Ni , C , Hedley , G J , Payne , J L , Svrcek , V , McDonald , C , Krishnan Jagadamma , L , Edwards , P , Martin , R , Jain , G , Carolan , D , Mariotti , D , Maguire , P , Samuel , I D W & Irvine , J T S 2017 , ' Charge carrier localised in zero-dimensional (CH 3 NH 3 ) 3 Bi 2 1 9 clusters ' , Nature Communications , vol. 8 , 170 , pp. 1-7 . https://doi.org/10.1038/s41467-017-00261-9

Publication

Nature Communications

Status

Peer reviewed

DOI

https://doi.org/10.1038/s41467-017-00261-9

ISSN

2041-1723

Type

Journal article

Rights

© The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/

Collections

University of St Andrews Research

URI

http://hdl.handle.net/10023/11332