Synthesis of Multilayer Silicene on Si(111)√3 × √3-Ag
2017
De Padova, Paola | Feng, Haifeng | Zhuang, Jincheng | Li, Zhi | Generosi, Amanda | Paci, Barbara | Ottaviani, Carlo | Quaresima, Claudio | Olivieri, Bruno | Krawiec, Mariusz | Du, Yi
The compelling experimental evidence of multilayer silicene synthesis on one monolayer of silver deposited on a silicon substrate, Si(111)√3 × √3-Ag, used as a template is reported. Auger electron spectroscopy, low-energy electron diffraction, scanning tunneling microscopy/spectroscopy, in situ Raman spectroscopy, and energy-dispersive in-plane X-ray diffraction were applied to achieve the fingerprints of √3 × √3 multilayer silicene. Density functional theory calculations provided the structural models of single, bilayer, and three-layer silicene on the Si(111)√3 × √3-Ag surface. Single-layer silicene retains its free-standing form. The structural models, which are consistent with the experimental findings, feature atomic structure substantially different from that of Si(111).
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