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

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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.

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

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Article information


Submitted
12 Feb 2020
Accepted
22 Mar 2020
First published
23 Mar 2020

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

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, Advance Article , DOI: 10.1039/D0NA00123F

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