NDLI: Hot-injection synthesis of monodispersed Cu2ZnSn(SxSe1−x)4 nanocrystals: tunable composition and optical properties

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Jem-Kun Ho, Jinn-Hsuan Fan, Jian-Cin Chang, Jia-Yaw Ou, Keng-Liang Huang, Chih-Ching Chen, Liang-Yih
Copyright Year	2012
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.
Starting Page	14667
Ending Page	14673
Page Count	7
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	29
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm31901b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Raman Band gap Oleylamine Ion Octadecene Solvent Reagent Crystal structure X-ray crystallography Raman spectroscopy Electronvolt
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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