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

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 CsPbB...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2019-10, Vol.9 (11), p.1537
Main Authors: Yun, Rui, Luo, Li, He, Jingqi, Wang, Jiaxi, Li, Xiaofen, Zhao, Weiren, Nie, Zhaogang, Lin, Zhiping
Format: Article
Language:English
Subjects:
Ammonium
Ammonium bromides
Cesium
Cetyltrimethylammonium bromide
Communication
Crystals
cspb2br5
cspbbr3
ctab
Ethanol
Investigations
Lead compounds
Ligands
Light emitting diodes
Metal halides
Morphology
Nanocrystals
Perovskites
phase transition
Phase transitions
Photoluminescence
Photons
Polarity
Quantum dots
Room temperature
solvent polarity
Solvents
Stability
Stoichiometry
Surface defects
Toluene
Transmission electron microscopy
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Summary: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 CsPbBr , such as CsPb Br . 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 CsPbBr and tetragonal CsPb Br . 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.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano9111537