Schmitz Marie, Kesper Lukas, Schulte Malte G H, Roese Peter, Berges Ulf, Westphal Carsten
Experimentelle Physik I, Technische Universität Dortmund, Otto-Hahn-Str 4a, 44221 Dortmund, Germany.
DELTA, Technische Universität Dortmund, Maria-Goeppert-Mayer Straße 2, 44221 Dortmund, Germany.
J Phys Condens Matter. 2021 May 28;33(27). doi: 10.1088/1361-648X/abfc16.
The chemical and structural characteristics of a low-dimensional Au-Si surface alloy are presented in this work. Alloy formation was obtained by deposition of a sub-monolayer Si on Au(110). This preliminary phase to Si nano-ribbons is being investigated, as the transition from clean Au(110) to a silicon nano-ribbon coated surface is not yet understood. A multiple technique study has been carried out for detailed atomic structure determination and chemical investigation. Particular attention is paid to the clarification of the structural arrangement at the surface and at the interface. Using low-energy electron diffraction, the periodicity of the structure on long-range order could be examined. By means of high-precision photoemission measurements using synchrotron radiation, the electronic and atomic structure of the alloy can be presented. The investigation by photoelectron spectroscopy (XPS) using soft x-rays for a high surface sensitivity showed different chemical environments in the high-resolution spectra. The x-ray photoelectron diffraction (XPD) measurements, which are sensitive to the local atomic order, gave an approach to the structural configuration of the alloy. A new structural arrangement was found simulating both Au and Si XPD patterns. The results are compared to former proposed structure models. A deconvolution of the Si 2XPD pattern revealed the origin of two chemically shifted XPS components.
本文介绍了一种低维金 - 硅表面合金的化学和结构特征。通过在金（110）上沉积亚单层硅来实现合金的形成。由于从清洁的金（110）到硅纳米带涂层表面的转变尚未明确，目前正在对这一硅纳米带的初步阶段进行研究。已开展了多项技术研究，用于详细确定原子结构和进行化学研究。特别关注表面和界面处结构排列的阐明。利用低能电子衍射，可以研究结构在长程有序方面的周期性。通过使用同步辐射进行高精度光发射测量，可以呈现合金的电子和原子结构。使用软X射线进行光电子能谱（XPS）研究，因其具有高表面灵敏度，在高分辨率光谱中显示出不同的化学环境。对局部原子有序敏感的X射线光电子衍射（XPD）测量，为合金的结构构型提供了一种方法。通过模拟金和硅的XPD图案，发现了一种新的结构排列。将结果与先前提出的结构模型进行了比较。对硅的2XPD图案进行去卷积，揭示了两个化学位移XPS组分的来源。
