A facile method to fabricate high-quality perovskite nanocrystals based on single crystal powder

Although great advancements have been successfully achieved in ligand-assisted reprecipitation strategy (LARP) towards lead halide perovskite nanocrystals (NCs) synthesis, it still remains challenging to develop bright and stable iodide-based perovskite NC via facile LARP. Herein, strikingly bright...

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Bibliographic Details
Published in:Nano research 2019-10, Vol.12 (10), p.2640-2645
Main Authors: Liao, Jin-Feng, Chen, Yi-Xin, Wei, Jun-Hua, Cai, Ya-Ting, Wang, Xu-Dong, Xu, Yang-Fan, Kuang, Dai-Bin
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Crystals
Iodides
Lead compounds
Luminescence
Materials Science
Metal halides
Nanocrystals
Nanotechnology
Perovskites
Photoluminescence
Photons
Powder
Precursors
Research Article
Single crystals
Solvation
Space charge
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Summary:Although great advancements have been successfully achieved in ligand-assisted reprecipitation strategy (LARP) towards lead halide perovskite nanocrystals (NCs) synthesis, it still remains challenging to develop bright and stable iodide-based perovskite NC via facile LARP. Herein, strikingly bright MAPbI 3 NCs with photoluminescence quantum yield (PLQY) as high as 79% are synthesized via replacing the raw material (MAI and PbI 2 ) with MAPbI 3 crystal powder during LARP procedure. It has been found that crystal powder derived MAPbI 3 NCs are more iodide-rich compared with that based on raw material, which is favorable to passivate the surface trap state. Accordingly, femtosecond transient absorption spectroscopies and space charge limited current measurements have corroborated that the trap density is much less in crystal powder resulted MAPbI 3 NCs. Further analyses indicate stronger solvation with reduced precursor colloid size has been observed in crystal powder derived precursor solution probably due to the formation of MAPbI 3 ·DMF. This work has provided a facile but valid method to enhance the photoluminescence of perovskite NC via modulating the beginning precursor solution.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-019-2501-x