Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Nano Lett. 2012 Jul 11;12(7):3507-11. doi: 10.1021/nl301047g. Epub 2012 Jun 4.
In the search for evidence of silicene, a two-dimensional honeycomb lattice of silicon, it is important to obtain a complete picture for the evolution of Si structures on Ag(111), which is believed to be the most suitable substrate for growth of silicene so far. In this work we report the finding and evolution of several monolayer superstructures of silicon on Ag(111), depending on the coverage and temperature. Combined with first-principles calculations, the detailed structures of these phases have been illuminated. These structures were found to share common building blocks of silicon rings, and they evolve from a fragment of silicene to a complete monolayer silicene and multilayer silicene. Our results elucidate how silicene forms on Ag(111) surface and provides methods to synthesize high-quality and large-scale silicene.
在寻找硅的二维蜂窝状晶格硅烯的证据时，获得 Ag(111) 上 Si 结构演变的完整图像非常重要，Ag(111) 被认为是迄今为止最适合生长硅烯的衬底。在这项工作中，我们报告了几种单层硅在 Ag(111)上的超结构的发现和演变，这取决于覆盖度和温度。结合第一性原理计算，阐明了这些相的详细结构。这些结构被发现具有硅环的共同构建块，它们从硅烯的碎片演变为完整的单层硅烯和多层硅烯。我们的结果阐明了硅烯如何在 Ag(111) 表面形成，并提供了合成高质量和大规模硅烯的方法。
