Electrochemical deposition of silicon and germanium from ionic liquids: interfacial processes, compounds and macroporous structures

在这个项目中，硅、锗和SiGe的结构沉积将在离子液体中电化学制备。硅和锗的共沉积使材料在沉积过程中改变颜色，这可能是由于量子限制效应。通过紫外/可见光谱电化学和xps测量，可以更深入地了解其形成和结合特性。纳米结构硅是未来锂离子电池的重要材料，因为这种材料比通常的锂/石墨插层化合物具有更高的能量密度。大孔硅和大孔锂/硅均可制成。此外，还将更详细地研究最近发现的离子液体溶剂化层在半导体沉积过程中的行为，以及它们如何影响隧道光谱法测定带隙。

In this project structured deposits of silicon, germanium and of SiGe shall be made electrochemically in ionic liquids. The codeposition of silicon and germanium gives a material which changes its colour during deposition, likely due to a quantum confinement effect. With UV/Vis spectroelectrochemistry and XPS-measurements a deeper insight into the formation and the binding properties shall be obtained. Nanostructured silicon is of high interest as material in future lithium-ion-batteries , as such a material would allow higher energy densities than the usual lithium/graphite intercalation compounds. Both macroporous silicon and macroporous lithium/silicon shall be made. Furthermore it shall be investigated in more detail how the recently found solvation layers of ionic liquids behave during semiconductor deposition and how they influence the determination of the band gap by tunneling spectroscopy.