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Research Article

Synthesis and transformation of zero-dimensional Cs3BiX6 (X = Cl, Br) perovskite-analogue nanocrystals

Hanjun Yang1, Tong Cai1, Exian Liu2, Katie Hills-Kimball1, Jianbo Gao2, Ou Chen1( )
Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, USA
Ultrafast Photophysics of Quantum Devices Laboratory, Department of Physics and Astronomy, Clemson University, South Carolina 29634, USA
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Abstract

The unique structure of zero-dimensional (0D) perovskite-analogues has attracted a great amount of research interest in recent years. To date, the current compositional library of 0D perovskites is largely limited to the lead-based Cs4PbX6 (X = Cl, Br, and I) systems. In this work, we report a new synthesis of lead-free 0D Cs3BiX6 (X = Cl, Br) perovskite-analogue nanocrystals (NCs) with a uniform cubic shape. We observe a broad photoluminescence peak centered at 390 nm for the 0D Cs3BiCl6 NCs at low temperatures. This feature originates from a self-trapped exciton mechanism. In situ thermal stability studies show that Cs3BiX6 NCs remain stable upon heating up to 200 °C without crystal structural degradation. Moreover, we demonstrate that the Cs3BiX6 NCs can transform into other bismuth-based perovskite-analogues via facile anion exchange or metal ion insertion reactions. Our study presented here offers the opportunity for further understanding of the structure-property relationship of 0D perovskite-analogue materials, leading toward their future optoelectronic applications.

Keywords

perovskite nanocrystalszero-dimensional perovskite-analoguebismuth-based perovskitepost-synthetic reactionsanion exchange

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Nano Research
Volume 13 Issue 1,
January 2020
Pages 282-291
DOI: 10.1007/s12274-019-2611-5
Cite this article:
Yang H, Cai T, Liu E, et al. Synthesis and transformation of zero-dimensional Cs3BiX6 (X = Cl, Br) perovskite-analogue nanocrystals. Nano Research, 2020, 13(1): 282-291. https://doi.org/10.1007/s12274-019-2611-5
Topics:
Bromine compoundsChlorine compoundsIon exchangeMetal ionsMetalsNanocrystalsPerovskite

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Received: 29 October 2019
Revised: 15 December 2019
Accepted: 16 December 2019
Published: 27 December 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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