Role of Surface Electronic Structure in Thin Film Molecular Ordering
- 16 December 2005
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 95 (25) , 256106
- https://doi.org/10.1103/physrevlett.95.256106
Abstract
We show that the orientation of pentacene molecules is controlled by the electronic structure of the surface on which they are deposited. We suggest that the near-Fermi level density of states above the surface controls the interaction of the substrate with the pentacene pi orbitals. A reduction of this density as compared to noble metals, realized in semimetallic Bi(001) and Si(111)(5 x 2)Au surfaces, results in pentacene standing up. Interestingly, pentacene grown on Bi(001) is highly ordered, yielding the first vertically oriented epitaxial pentacene thin films observed to date.Keywords
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