One-dimensional confinement of organic molecules via selective adsorption on CaF1 versus CaF2

We have integrated one-dimensional organic structures into semiconductor/in sulator nanostructures by controlled self-assembly. Stepped Si(111) surface s with self-organized CaF1/CaF2 stripe patterns serve as mask for selective adsorption of 3,10-di(propyl)perylene. These molecules adsorb preferential ly on CaF1 nanostripes, rather than on CaF2, This property is used to fabri cate large assemblies of parallel, equidistant stripes 1-15 nm wide. We dis cuss the selectivity in terms of a mechanism where the HOMO and LUMO of the molecule interact with the valence band and conduction band of CaF1 and Ca F2. (C) 1999 Elsevier Science B,V. All rights reserved.