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Silver thiocyanate treatment-induced enhancement of photoluminescence efficiency of CsPbBr3 perovskite quantum dots

  • Original Paper - Condensed Matter
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Abstract

Metal halide perovskite nanostructures have received much attention for many optoelectronic devices, such as solar cells, light-emitting diodes, photodetectors, and sensors due to their sharp emission spectra and adjustable wide optical bandgap. However, low emission efficiency and stability still impede their development and application. This paper reports a facile surface modification of the CsPbBr3 quantum dots (QDs) to enhance the optical performance using a silver thiocyanate (AgSCN) additive. Structural and chemical investigations show that the QD morphology and size do not change significantly, while the SCN– anion is incorporated into the CsPbBr3 QDs as a function of AgSCN loading. In addition, the SCN– anion interacts with Pb2+ in the CsPbBr3 QDs, which indicates that the SCN– anion fills out the Br– anion vacancy site or substitutes the Br- anion without significantly affecting the ligand configuration. Therefore, the photoluminescence (PL) intensity and stability of the AgSCN-treated CsPbBr3 QDs are improved compared to the pristine one, because the AgSCN plays a critical role in recovering the appropriate surface stoichiometry and eliminating the defective surface states.

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Acknowledgements

This study was supported by the Research program funded by the Seoultech (Seoul National University of Science & Technology)

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul, 01811, Republic of Korea

    Ho-Young Kim, Seung-Beom Cho & Il-Kyu Park

  2. School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK

    Bo Hou

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  1. Ho-Young Kim
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  2. Seung-Beom Cho
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Correspondence to Bo Hou or Il-Kyu Park.

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Kim, HY., Cho, SB., Hou, B. et al. Silver thiocyanate treatment-induced enhancement of photoluminescence efficiency of CsPbBr3 perovskite quantum dots. J. Korean Phys. Soc. 81, 150–157 (2022). https://doi.org/10.1007/s40042-022-00501-2

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  • DOI: https://doi.org/10.1007/s40042-022-00501-2

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