Molecular transport through single molecules between eplitaxially grown contacts

在表面科学小组和有机化学小组的合作下，这个实验项目将纳米尺寸接触的产生与基于二茂铁的有机分子和相关钴系统的合成结合在一起，将单分子落实到接触几何中，并通过电子传输测量、隧道显微镜和光谱分析对其进行物理表征。纳米级的接触将通过电子束光刻、自组织和电迁移相结合的方法实现，在低掺杂的硅上使用银和铅的外延、晶体和极薄的金属结构。这将实现接触几何，允许在原子水平上表征这些接触，并将吸附分子的几何结构和电子态与它们的电输运性质直接关联。分子输运性质的系统研究包括金属接触材料的变化、金属接触材料上附着的分子以及形成金属-分子键的分子基团。这一贡献包括引入银和铅作为金属结构和二茂铁分子，以及由(环丁二烯)-环戊二烯基钴衍生的夹心络合物通过各种端基连接到金属上。

In collaboration of a group from surface science with a group from organic chemistry, this experimental project combines the generation of nano-size contacts with the synthesis of ferrocene-based organic molecules and realted cobalt systems, the implementation of single molecules into the contact geometry and their physical characterization by electrical transport measurements, tunneling microscopy and spectroscopy. Nano-size contacts will be realized using a combination of e-beam lithography, self organization and electromigration, using epitaxial, crystalline and extremely thin metallic structures of Ag and Pb on low-doped Si. This will realize contact geometries that allow the characterization of these contacts on the atomic level and the direct correlation of geometric structures and electronic states of the adsorbed molecules with the electric transport properties of them. Systematic studies of molecular transport properties include the variation of the metallic contact materials, the molecules attached of them, and the molecular groups forming the metal-molecule bond. This contribution consists of introducing Ag and Pb as metallic structures and ferrocene-based molecules as well as sandwich complexes derived from (cyclobutadiene)-cyclopentadienylcobald to be attaches to the metals by a variety of end groups.