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Title: The role of ion exchange in the passivation of In(Zn)P nanocrystals with ZnS
Authors: Cho, Deok-Yong
Xi, Lifei
Boothroyd, Chris
Kardynal, Beata
Lam, Yeng Ming
Keywords: Nanocrystals
Ion Exchange
Issue Date: 2016
Source: Cho, D.-Y., Xi, L., Boothroyd, C., Kardynal, B., & Lam, Y. M. (2016). The role of ion exchange in the passivation of In(Zn)P nanocrystals with ZnS. Scientific Reports, 6, 22818-. doi:10.1038/srep22818
Series/Report no.: Scientific Reports
Abstract: We have investigated the chemical state of In(Zn)P/ZnS core/shell nanocrystals (NCs) for color conversion applications using hard X-ray absorption spectroscopy (XAS) and photoluminescence excitation (PLE). Analyses of the edge energies as well as the X-ray absorption fine structure (XAFS) reveal that the Zn2+ ions from ZnS remain in the shell while the S2− ions penetrate into the core at an early stage of the ZnS deposition. It is further demonstrated that for short growth times, the ZnS shell coverage on the core was incomplete, whereas the coverage improved gradually as the shell deposition time increased. Together with evidence from PLE spectra, where there is a strong indication of the presence of P vacancies, this suggests that the core-shell interface in the In(Zn)P/ZnS NCs are subject to substantial atomic exchanges and detailed models for the shell structure beyond simple layer coverage are needed. This substantial atomic exchange is very likely to be the reason for the improved photoluminescence behavior of the core-shell particles compare to In(Zn)P-only NCs as S can passivate the NCs surfaces.
DOI: 10.1038/srep22818
Rights: © 2016 The Authors (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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