Insight into the Electrodeposition of SixGe1鈥?i>x Thin Films with Variable Compositions from a Room Temperature Ionic Liquid

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• 作者：Abhishek Lahiri ; Mark Olschewski ; Oliver H枚fft ; Sherif Zein El Abedin ; Frank Endres
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：December 12, 2013
• 年：2013
• 卷：117
• 期：49
• 页码：26070-26076
• 全文大小：510K
• 年卷期：v.117,no.49(December 12, 2013)
• ISSN：1932-7455

文摘

In this article, we investigated the electrodeposition of Si_xGe_1鈥?i>x from 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide containing different molar concentrations of SiCl₄ and GeCl₄. Upon the deposition of Si_xGe_1鈥?i>x using a 1:1 molar ratio of SiCl₄ and GeCl₄, a color change of the deposit from red to green was observed during the cyclic voltammetric scan. On increasing the concentration of SiCl₄, only a reddish deposit could be seen during cyclic voltammetry. When the concentration of GeCl₄ was increased, only a black deposit was obtained. Constant potential electrodeposition showed the formation of Si_xGe_1鈥?i>x with varying proportions of Si to Ge on changing the molar ratio in the solution. To further evaluate the reaction mechanism of the electrodeposition process, in situ UV visible spectroelectrochemistry was performed. From the changes in the UV spectra combined with XPS and SEM observations, a layered growth process has been proposed during the formation of Si_xGe_1鈥?i>x.