Hot-injection synthesis of monodispersed Cu 2ZnSn(S xSe 1-x) 4 nanocrystals: Tunable composition and optical properties

Keng Liang Ou, Jian Cin Fan, Jem Kun Chen, Chih Ching Huang, Liang Yih Chen, Jinn Hsuan Ho, Jia Yaw Chang

研究成果: 雜誌貢獻文章同行評審

66 引文 斯高帕斯(Scopus)

摘要

In this study, we demonstrate that Cu 2ZnSn(S xSe 1-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 Cu 2ZnSn(S xSe 1-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 Cu 2ZnSn(S xSe 1-x) 4 nanocrystals. The A 1 symmetry modes of the Cu 2ZnSn(S xSe 1-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 Cu 2ZnSn(S xSe 1-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 Cu 2ZnSn(S xSe 1-x) 4 nanocrystals had good miscibility.
原文英語
頁(從 - 到)14667-14673
頁數7
期刊Journal of Materials Chemistry
22
發行號29
DOIs
出版狀態已發佈 - 八月 7 2012

ASJC Scopus subject areas

  • 材料化學
  • 化學 (全部)

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