Methanol-induced fast CsBr release results in phase-pure CsPbBr3 perovskite nanoplatelets

Xin Liu; Zhao Luo; Wenxu Yin; Aleksandr P. Litvin; Alexander V. Baranov; Jiaqi Zhang; Wenyan Liu; Xiaoyu Zhang; Weitao Zheng

doi:10.1039/D0NA00123F

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Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

Xin Liu,†^a Zhao Luo,†^a Wenxu Yin,^a Aleksandr P. Litvin,

^b Alexander V. Baranov,

^b Jiaqi Zhang,^a Wenyan Liu,^c Xiaoyu Zhang

*^a and Weitao Zheng

*^a

Author affiliations

* Corresponding authors

^a Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun, P. R. China
E-mail: zhangxiaoyu@jlu.edu.cn, wtzheng@jlu.edu.cn

^b Center of Information Optical Technology, ITMO University, 49 Kronverksky Pr., St. Petersburg 197101, Russia

^c College of Materials Science & Engineering, Beihua University, Jilin, P. R. China

Abstract

Formation of a non-emissive wide bandgap CsPb₂Br₅ component often accompanies the synthesis of CsPbBr₃ perovskites, introducing undesired energy states and impeding the charge transport. Here, we demonstrate that a small amount of a methanol additive can promote the CsBr release rate, facilitating CsPbBr₃ formation and suppressing CsPb₂Br₅ formation. Some of the methanol ionizes into CH₅O⁺ and CH₃O⁻, which act as surface ligands and change the crystallization environment, inducing shape evolution from spherical nanocrystals to rectangular nanoplatelets (NPLs), leading to monodispersed and phase-pure 8 unit-cell-thick CsPbBr₃ NPLs. Meanwhile, nonradiative recombination processes are inhibited as a result of NPL surface passivation. Bright CsPbBr₃ NPLs with a photoluminescence quantum yield reaching 90% were employed as emitters for electroluminescent light-emitting devices.

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DOI: https://doi.org/10.1039/D0NA00123F
Article type: Paper
Submitted: 12 Feb 2020
Accepted: 22 Mar 2020
First published: 23 Mar 2020
This article is Open Access

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Nanoscale Adv., 2020,2, 1973-1979

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Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

X. Liu, Z. Luo, W. Yin, A. P. Litvin, A. V. Baranov, J. Zhang, W. Liu, X. Zhang and W. Zheng, Nanoscale Adv., 2020, 2, 1973 DOI: 10.1039/D0NA00123F

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Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

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Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

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