Growth mechanism of strongly emitting CH3NH3PbBr3 perovskite nanocrystals with a tunable bandgap

He Huang, Johannes Raith, Stephen V. Kershaw, Sergii Kalytchuk, Ondrej Tomanec, Lihong Jing, Andrei S. Susha, Radek Zboril and Andrey L. Rogach ()
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He Huang: City University of Hong Kong
Johannes Raith: City University of Hong Kong
Stephen V. Kershaw: City University of Hong Kong
Sergii Kalytchuk: Faculty of Science, Department of Physical Chemistry, Palacky University Olomouc
Ondrej Tomanec: Faculty of Science, Department of Physical Chemistry, Palacky University Olomouc
Lihong Jing: Institute of Chemistry, Chinese Academy of Sciences, Bei Yi Jie 2, Zhong Guan Cun
Andrei S. Susha: City University of Hong Kong
Radek Zboril: Faculty of Science, Department of Physical Chemistry, Palacky University Olomouc
Andrey L. Rogach: City University of Hong Kong

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

Abstract: Abstract Metal halide perovskite nanocrystals are promising materials for a diverse range of applications, such as light-emitting devices and photodetectors. We demonstrate the bandgap tunability of strongly emitting CH3NH3PbBr3 nanocrystals synthesized at both room and elevated (60 °C) temperature through the variation of the precursor and ligand concentrations. We discuss in detail the role of two ligands, oleylamine and oleic acid, in terms of the coordination of the lead precursors and the nanocrystal surface. The growth mechanism of nanocrystals is elucidated by combining the experimental results with the principles of nucleation/growth models. The proposed formation mechanism of perovskite nanocrystals will be helpful for further studies in this field and can be used as a guide to improve the synthetic methods in the future.

Date: 2017
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DOI: 10.1038/s41467-017-00929-2

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