Quaternary CuIn(S1鈭?i>xSex)2 Nanocrystals: Facile Heating-Up Synthesis, Band Gap Tuning, and Gram-Scale Production

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• 作者：Ming-Yi Chiang ; Shu-Hao Chang ; Chia-Yu Chen ; Fang-Wei Yuan ; Hsing-Yu Tuan
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：1592-1599
• 全文大小：1366K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1932-7455

文摘

Tetragonal chalcopyrite CuIn-(S_1鈭?i>xSe_x)₂ (0 鈮?x 鈮?1) nanocrystals were synthesized by reacting a mixture of CuCl, InCl₃, S, and Se in the presence of oleylamine at 265 掳C. The S/Se composition ratio in the CuIn(S_1鈭?i>xSe_x)₂ could be tuned across the entire composition range of x from 0 to 1 by modulating the S/Se reactant mole ratio. The tetragonal lattice constants, that is, a and c, increase linearly with the increase of Se content, following Vegard鈥檚 law. The band gap energies of CuIn(S_1鈭?i>xSe_x)₂ nanocrystals could be tuned in the range between 0.98 and 1.46 eV and change nonlinearly with respect to x, deriving a bowing parameter of 0.17 eV. In addition, the method developed in this study was scalable to achieve gram-scale production of stoichiometry-controlled CuIn(S_1鈭?i>xSe_x)₂ and CuIn_1鈭?i>xGa_xSe₂ nanocrystals.