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Open AccessArticle

Epitaxial Order Driven by Surface Corrugation: Quinquephenyl Crystals on a Cu(110)-(2×1)O Surface

1
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria
2
Department of Condensed Matter Physics, Masaryk University, 611 37 Brno, Czech Republic
3
Institut für Physik, Karl-Franzens Universität Graz, Universitätsplatz 5, 8010 Graz, Austria
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(7), 373; https://doi.org/10.3390/cryst9070373
Received: 14 June 2019 / Revised: 15 July 2019 / Accepted: 16 July 2019 / Published: 22 July 2019
(This article belongs to the Special Issue Investigation of Nanostructures with X-ray Scattering Techniques)
A 30 nm thick quinquephenyl (5P) film was grown by molecular beam deposition on a Cu(110)(2×1)O single crystal surface. The thin film morphology was studied by light microscopy and atomic force microscopy and the crystallographic structure of the thin film was investigated by X-ray diffraction methods. The 5P molecules crystallise epitaxially with (201)5P parallel to the substrate surface (110)Cu and with their long molecular axes parallel to [001]Cu. The observed epitaxial alignment cannot be explained by lattice matching calculations. Although a clear minimum in the lattice misfit exists, it is not adapted by the epitaxial growth of 5P crystals. Instead the formation of epitaxially oriented crystallites is determined by atomic corrugations of the substrate surface, such that the initially adsorbed 5P molecules fill with its rod-like shape the periodic grooves of the substrate. Subsequent crystal growth follows the orientation and alignment of the molecules taken within the initial growth stage. View Full-Text
Keywords: organic films; thin film epitaxy organic films; thin film epitaxy
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MDPI and ACS Style

Resel, R.; Koini, M.; Novak, J.; Berkebile, S.; Koller, G.; Ramsey, M. Epitaxial Order Driven by Surface Corrugation: Quinquephenyl Crystals on a Cu(110)-(2×1)O Surface. Crystals 2019, 9, 373.

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