Electronic structure and optical properties of transition metal doped silicon clusters on surfaces

表面过渡金属掺杂硅团簇的电子结构和光学性质

• 批准号: 138260344
• 负责人: Professor Dr. Tobias Lau
• 金额: --
• 依托单位: Arbeitsgruppe Cluster und Nanokristalle (AG Möller)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/138260344?language=en
• 关键词: Electronic; structure; optical; properties; transition

Transition metal-doped silicon clusters are attracting considerable attention because of their tunable HOMO-LUMO gaps and a presumed high stability of `magic clusters, which are characterized by electronic shell closure and a highly symmetric silicon shell encapsulating a transition metal atom. In spite of extensive theoretical work, their optical properties are hitherto unknown, owing to a lack of experiments which are sensitive enough to investigate the optical properties of size-selected clusters only available in trace quantities. In this project we aim at a detailed understanding of the electronic structure and the optical properties of size-selected doped silicon clusters on surfaces by probing them directly with UV/visible photoabsorption, fluorescence, and X-ray absorption spectroscopy. A central question that will be addressed with these methods concerns the fundamental effect of doping on the optical and electronic properties of a nanoscale semiconductor cluster defined to atomic precision.

过渡金属掺杂的硅团簇由于其HOMO-LUMO能隙可调和具有高稳定性的“幻数团簇”（magic cluster）而引起了人们的广泛关注。“幻数团簇”的特征在于电子壳层闭合和高度对称的硅壳层包裹过渡金属原子。尽管有大量的理论工作，它们的光学性质是迄今为止未知的，由于缺乏足够灵敏的实验来研究仅在痕量中可用的大小选择的团簇的光学性质。在这个项目中，我们的目标是通过直接用紫外/可见光吸收，荧光和X射线吸收光谱探测表面上的大小选择的掺杂硅簇的电子结构和光学性质的详细了解。一个中心的问题，将解决这些方法涉及的基本效果的掺杂定义为原子精度的纳米级半导体簇的光学和电子性质。