One-dimensional confinement of organic molecules via selective adsorption on CaF_1 versus CaF_2

摘要

We have integrated one-dimensional organic structures into semiconductor/insulator nanostructures by controlled self-assembly. Stepped Si(111) surfaces with self-organized CaF_1/CaF_2 stripe patterns serve as mask for selective adsorption of 3,10-di(propyl)perylene. These molecules adsorb preferentially on CaF_1 nanostripes, rather than on CaF_2. This property is used to fabricate large assemblies of parallel, equidistant stripes 1-15 nm wide. We discuss the selectivity in terms of a mechanism where the HOMO and LUMO of the molecule interact with the valence band and conduction band of CaF_1 and CaF_2.