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Pentacene-based nanorods on Au(111) single crystals: Charge transfer, diffusion, and step-edge barriers |
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| Authors: | Sabine-Antonia Savu Sabine Abb Simon Schundelmeier Jonathan D Saathoff James M Stevenson Christina Tönshoff Holger F Bettinger Paulette Clancy M Benedetta Casu Thomas Chassé | |
| Affiliation: | 1322. Institute of Physical and Theoretical Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076, Tuebingen, Germany 2322. School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York, 14853, USA 3322. Institute of Organic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076, Tuebingen, Germany |
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| Abstract: | We investigate nanorod assemblies of two δ 4-substituted pentacenes, namely (2,3-X 2-9,10-Y 2)-substituted pentacenes with X = Y = OCH3 (MOP) and with X = F, Y = OCH3 (MOPF), grown on Au(111) single crystals. By using a multi-technique approach based on ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption, we find evidence for charge transfer screening at the interface with gold. Furthermore, the MOP and MOPF nanorods show a rough surface morphology, which was investigated with atomic force microscopy. We use molecular simulation techniques to investigate the energetic barriers to diffusion and to traverse step-edges to estimate their influence on the nanorod roughness. We find that barriers to surface diffusion on a terrace are anisotropic and that their direction favors the formation of nanorods in these materials.  | |
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