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Facile synthesis of CsPbBr3/PbSe composite clusters
Date
2018-12-18
Author
Thang Phan Nguyen, Thang Phan Nguyen
Öztürk, Abdullah
PARK, JONGEE
Sohn, Woonbae
Tae Hyung Lee, Tae Hyung Lee
Jang, Ho Won
Kim, Soo Young
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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In this work, CsPbBr3 and PbSe nanocomposites were synthesized to protect perovskite material from self-enlargement during reaction. UV absorption and photoluminescence (PL) spectra indicate that the addition of Se into CsPbBr3 quantum dots modified the electronic structure of CsPbBr3, increasing the band gap from 2.38 to 2.48 eV as the Cs:Se ratio increased to 1:3. Thus, the emission color of CsPbBr3 perovskite quantum dots was modified from green to blue by increasing the Se ratio in composites. According to X-ray diffraction patterns, the structure of CsPbBr3 quantum dots changed from cubic to orthorhombic due to the introduction of PbSe at the surface. Transmission electron microscopy and X-ray photoemission spectroscopy confirmed that the atomic distribution in CsPbBr3/PbSe composite clusters is uniform and the composite materials were well formed. The PL intensity of a CsPbBr3/PbSe sample with a 1:1 Cs: Se ratio maintained 50% of its initial intensity after keeping the sample for 81 h in air, while the PL intensity of CsPbBr3 reduced to 20% of its initial intensity. Therefore, it is considered that low amounts of Se could improve the stability of CsPbBr3 quantum dots.
Subject Keywords
General Materials Science
,
CsPbBr3
,
PbSe
,
Cesium lead halide perovskite
,
Nanocomposite
URI
https://hdl.handle.net/11511/38925
Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
DOI
https://doi.org/10.1080/14686996.2017.1412231
Collections
Department of Metallurgical and Materials Engineering, Article