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Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
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Nanomaterials 2019, 9(11), 1537; https://doi.org/10.3390/nano9111537
Received: 16 September 2019 / Revised: 10 October 2019 / Accepted: 28 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Computational Quantum Physics and Chemistry of Nanomaterials)
Cesium lead halide perovskite nanocrystals (NCs) have attracted enormous interest in light-emitting diode, photodetector and low-threshold lasing application in terms of their unique optical and electrical performance. However, little attention has been paid to other structures associated with CsPbBr3, such as CsPb2Br5. Herein, we realize a facile method to prepare dual-phase NCs with improved stability against polar solvents by replacing conventional oleylamine with cetyltrimethyl ammonium bromide (CTAB) in the reprecipitation process. The growth of NCs can be regulated with different ratios of toluene and ethanol depending on solvent polarity, which not only obtains NCs with different sizes and morphologies, but also controls phase transition between orthorhombic CsPbBr3 and tetragonal CsPb2Br5. The photoluminescence (PL) and defect density calculated exhibit considerable solvent polarity dependence, which is ascribed to solvent polarity affecting the ability of CTAB to passivate surface defects and improve stoichiometry in the system. This new synthetic method of perovskite material will be helpful for further studies in the field of lighting and detectors. View Full-Text
Keywords: CsPbBr3; CsPb2Br5; solvent polarity; CTAB; phase transition CsPbBr3; CsPb2Br5; solvent polarity; CTAB; phase transition
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Yun, R.; Luo, L.; He, J.; Wang, J.; Li, X.; Zhao, W.; Nie, Z.; Lin, Z. Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature. Nanomaterials 2019, 9, 1537.

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