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Influence of Substrate Bonding and Surface Morphology on Dynamic Organic Layer Growth: Perylenetetracarboxylic Dianhydride on Au(111)

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Schmidt,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Experimentelle Physik, Universität Würzburg;

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Marchetto,  Helder
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Umbach,  Eberhard
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Experimentelle Physik, Universität Würzburg;

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Citation

Schmidt, T., Marchetto, H., Groh, U., Fink, R. H., Freund, H.-J., & Umbach, E. (2018). Influence of Substrate Bonding and Surface Morphology on Dynamic Organic Layer Growth: Perylenetetracarboxylic Dianhydride on Au(111). Langmuir, 34(19), 5444-5453. doi:10.1021/acs.langmuir.8b00493.


Cite as: http://hdl.handle.net/21.11116/0000-0001-8AB2-A
Abstract
We investigated the dynamics of the initial growth of the first epitaxial layers of perylenetetracarboxylic dianhydride (PTCDA) on the Au(111) surface with high lateral resolution using the aberration-corrected spectro-microscope SMART. With this instrument, we could simultaneously study the different adsorption behaviors and layer growth on various surface areas consisting of either a distribution of flat (111) terraces, separated by single atomic steps (“ideal surface”), or on areas with a high density of step bunches and defects (“realistic surface”). The combined use of photoemission electron microscopy, low-energy electron microscopy, and μ-spot X-ray absorption provided a wealth of new information, showing that the growth of the archetype molecule PTCDA not only has similarities but also has significant differences when comparing Au(111) and Ag(111) substrate surfaces. For instance, under otherwise identical preparation conditions, we observed different growth mechanisms on different surface regions, depending on the density of step bunches. In addition, we studied the spatially resolved desorption behavior which also depends on the substrate morphology.