title: Epitaxy of rodlike organic molecules on sheet silicates--a growth model based on experiments and simulations.
abstract: During the last years, self-assembled organic nanostructures have been recognized as a proper fundament for several electrical and optical applications. In particular, phenylenes deposited on muscovite mica have turned out to be an outstanding material combination. They tend to align parallel to each other forming needlelike structures. In that way, they provide the key for macroscopic highly polarized emission, waveguiding, and lasing. The resulting anisotropy has been interpreted so far by an induced dipole originating from the muscovite mica substrate. Based on a combined experimental and theoretical approach, we present an alternative growth model being able to explain molecular adsorption on sheet silicates in terms of molecule-surface interactions only. By a comprehensive comparison between experiments and simulations, we demonstrate that geometrical changes in the substrate surface or molecule lead to different molecular adsorption geometries and needle directions which can be predicted by our growth model.
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria. clemens.simbrunner@jku.at
authors.forename: Clemens
authors.initials: C
authors.lastname: Simbrunner
authors.forename: Dmitrii
authors.initials: D
authors.lastname: Nabok
authors.forename: Gerardo
authors.initials: G
authors.lastname: Hernandez-Sosa
authors.forename: Martin
authors.initials: M
authors.lastname: Oehzelt
authors.forename: Tatjana
authors.initials: T
authors.lastname: Djuric
authors.forename: Roland
authors.initials: R
authors.lastname: Resel
authors.forename: Lorenz
authors.initials: L
authors.lastname: Romaner
authors.forename: Peter
authors.initials: P
authors.lastname: Puschnig
authors.forename: Claudia
authors.initials: C
authors.lastname: Ambrosch-Draxl
authors.forename: Ingo
authors.initials: I
authors.lastname: Salzmann
authors.forename: Günther
authors.initials: G
authors.lastname: Schwabegger
authors.forename: Irene
authors.initials: I
authors.lastname: Watzinger
authors.forename: Helmut
authors.initials: H
authors.lastname: Sitter