title: Role of surface electronic structure in thin film molecular ordering.
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.
authors.affiliation: Sandia National Laboratories, P. O. Box 5800, Albuquerque, New Mexico 87185-1427, USA.
authors.forename: G E
authors.initials: GE
authors.lastname: Thayer
authors.forename: J T
authors.initials: JT
authors.lastname: Sadowski
authors.forename: F
authors.initials: F
authors.lastname: Meyer zu Heringdorf
authors.forename: T
authors.initials: T
authors.lastname: Sakurai
authors.forename: R M
authors.initials: RM
authors.lastname: Tromp