Electrodeposition of Ge, Si and SixGe1-x from an air- and water-stable ionic liquid
Electrodeposition of Ge, Si and SixGe1-x from an air- and water-stable ionic liquid
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DOI：
10.1039/b806996b
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发表时间：
2008-01-01
影响因子：
3.3
通讯作者：
Endres, F.
中科院分区：
文献类型：
--
作者：
Al-Salman, R.;El Abedin, S. Zein;Endres, F.
通过循环伏安法和高分辨率扫描电子显微镜研究了以 GeCl4 和/或 SiCl4 作为前驱体的空气和水稳定离子液体 1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰基）酰胺 ([Py1,4] Tf2N) 电沉积 Ge、Si 和 SixGe1-x。 [Py1,4] Tf2N 中的 GeCl2 在两室电池中通过电化学方法制备，用作 Ge 前体而不是 GeCl4，以避免 Ge(IV) 对沉积的 Ge 的化学侵蚀。硅、锗和 SixGe1-x 可以在这种离子液体中重复且轻松地沉积。有趣的是，SixGe1-x 沉积物在室温下电沉积过程中表现出强烈的颜色变化（从红色到蓝色），这可能是由于量子尺寸效应造成的。观察到的颜色表明带隙至少在 1.5 到 3.2 eV 之间。证明了离子液体在 SixGe1-x 电沉积中的潜力。
The electrodeposition of Ge, Si and, for the first time, of SixGe1-x from the air- and water-stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([Py1,4] Tf2N) containing GeCl4 and/or SiCl4 as precursors is investigated by cyclic voltammetry and high-resolution scanning electron microscopy. GeCl2 in [Py1,4] Tf2N is electrochemically prepared in a two-compartment cell to be used as Ge precursor instead of GeCl4 in order to avoid the chemical attack of Ge(IV) on deposited Ge. Silicon, germanium and SixGe1-x can be deposited reproducibly and easily in this ionic liquid. Interestingly, the SixGe1-x deposit showed a strong colour change (from red to blue) at room temperature during electrodeposition, which is likely to be due to a quantum size effect. The observed colours are indicative of band gaps between at least 1.5 and 3.2 eV. The potential of ionic liquids in SixGe1-x electrodeposition is demonstrated.