Highly Stable CsPbX3/PbSO4 Core/Shell Nanocrystals Synthesized by a Simple Post‐Treatment Strategy

All‐inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I, or their mixture) nanocrystals (NCs) have recently emerged as a promising photoelectric material; however, developing highly stable CsPbX3 NCs still remains a challenge due to their intrinsic ionic nature. This work presents a simple and f...

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Bibliographic Details
Published in:Advanced optical materials 2021-03, Vol.9 (5), p.n/a
Main Authors: Zhong, Qixuan, Liu, Jun, Chen, Shuhua, Li, Pengli, Chen, Jianian, Guan, Wenhao, Qiu, Yinghua, Xu, Yong, Cao, Muhan, Zhang, Qiao
Format: Article
Language:English
Subjects:
Acetone
Anion exchanging
core/shell heterostructures
CsPbX 3
Encapsulation
Ethanol
Heterostructures
high stability
Lead compounds
Light irradiation
Materials science
Metal halides
Nanocrystals
Optical properties
Optics
PbSO 4
perovskite nanocrystals
Perovskites
Photoelectricity
post‐treatment
Shell stability
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Summary:All‐inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I, or their mixture) nanocrystals (NCs) have recently emerged as a promising photoelectric material; however, developing highly stable CsPbX3 NCs still remains a challenge due to their intrinsic ionic nature. This work presents a simple and facile post‐treatment strategy to encapsulate CsPbX3 NC with PbSO4 nanoshell at single‐particle level. Compared to pristine CsPbX3 NCs, the as‐prepared CsPbX3/PbSO4 NCs exhibit significant enhancement in the optical properties. Benefiting from the efficient protection of inert PbSO4 nanoshell, the obtained CsPbX3/PbSO4 core/shell NCs demonstrate great stability against polar solvents, including ethanol and acetone, and light irradiation. Furthermore, anion‐exchange reaction is strongly restricted upon the encapsulation of PbSO4 shell. This work provides an alternative approach for the synthesis of highly stable CsPbX3 NCs, and paves a new way for the preparation of core/shell heterostructures based on lead halide perovskite NCs. CsPbX3/PbSO4 core–shell nanocrystals are prepared through a post‐treatment strategy involving octylammonium sulfate (OctAm‐SO4) as the precursor. The as‐obtained samples exhibit enhanced optical properties and high stability against polar solvents, light irradiation, and anion‐exchange. This work paves a new way for the preparation of core/shell heterostructures based on lead halide perovskite nanocrystals.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202001763