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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38508

Title: Hot-Injection Synthesis of Monodispersed Cu2ZnSn(SxSe1-x)4 Nanocrystals: Tunable Composition and Optical Properties
Authors: Keng-Liang Ou;Jian-Cin Fan;Jem-Kun Chen;Chih-Ching Huang;Liang-Yih Chen;Jinn-Hsuan Ho;Jia-Yaw Chang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Date: 2012
Issue Date: 2016-09-08T03:09:03Z
Publisher: Journal of Materials Chemistry
Abstract: Abstract: In this study, we demonstrate that Cu2ZnSn(SxSe1−x)4 nanocrystals with a tunable bandgap could be synthesized by a “hot-injection” protocol. In this protocol, metal stearates dissolved in oleylamine were injected into a hot solution of anion precursors in 1-octadecene (ODE) at a given reaction temperature. ODE, which is a low-cost, low-hazard, and air-stable liquid, was used as the solvent. Oleylamine was chosen as both the reagent to activate the precursors and as the capping agent for the nanocrystals. The composition of the Cu2ZnSn(SxSe1−x)4 nanocrystals could be adjusted across the x range from 0 to 1 by varying the S/Se reactant ratio. The lattice parameters (a and c) measured from X-ray diffraction patterns decreased linearly with increasing Se content. This trend was consistent with Vegard's law, which confirmed the formation of homogeneous Cu2ZnSn(SxSe1−x)4 nanocrystals. The A1 symmetry modes of the Cu2ZnSn(SxSe1−x)4 nanocrystals seen by Raman spectroscopy gradually shifted with decreasing x (S content) to the lower frequency side and completely disappeared when x = 0. The absorption spectra of the Cu2ZnSn(SxSe1−x)4 nanocrystals revealed that the bandgaps of the nanocrystals could be adjusted over the range 1.0–1.5 eV by decreasing the S content. The relatively small value for the bowing parameter indicated that the synthesized Cu2ZnSn(SxSe1−x)4 nanocrystals had good miscibility.
Relation: 29
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38508
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