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Effect of Cu/In ratio and shell thickness on the photo-stability of CuInS2/ZnS nanocrystals

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Abstract

CuInS2 core nanocrystals (NCs) with different Cu/In ratios are synthesized, and a rapid synthesis method is used to overcoat ZnS shells onto them. A time-resolved photoluminescence study revealed that a broad PL peak consists of the contribution from two kinds of donor–acceptor pairs (DAPs), and as indicated by photo-stability measurements, higher energy DAPs are sensitive to irradiation, resulting in the photo-instability of CuInS2 NCs. The intensity ratio between high-energy DAPs and low-energy ones is decreased with the decrease of the Cu/In ratio, and it is suggested that the high energy DAPs are near the core/shell interfaces, and the low energy ones are inside the cores. The shell's overcoating, which would keep the higher energy DAPs away from the surroundings, could improve the photo-stability of the NCs.

Graphical abstract: Effect of Cu/In ratio and shell thickness on the photo-stability of CuInS2/ZnS nanocrystals

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Publication details

The article was received on 04 Sep 2017, accepted on 03 Nov 2017 and first published on 03 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04032F
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Effect of Cu/In ratio and shell thickness on the photo-stability of CuInS2/ZnS nanocrystals

    B. Huang, R. Xu, L. Zhang, Y. Yuan, C. Lu, Y. Cui and J. Zhang, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC04032F

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