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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.51: Poster

Donnerstag, 23. März 2017, 17:00–19:00, P1C

Understanding Epitaxial Growth of Perfluoropentacene on Graphite — •Felix Widdascheck and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7, D-35032 Marburg, Germany

Understanding and controlling the growth of organic molecular films is crucial for their use in optoelectronic devices. A common approach is to use different substrates in order to mediate the growth and control the orientation and polymorph in the film. Therefore, the substrate-molecule interface is of particular importance as this controls the initial stage of film growth. In this regard an interesting model system are perfluoropentacene (PFP) films which grow epitaxially on graphite and exhibit a new, substrate induced π-stacked polymorph. [1, 2] Here, we report on a STM study of the PFP/Graphite interface and the initial stage of film growth. Using single crystalline graphite and tip assisted removing of PFP molecules the adlayer structure and the azimuthal orientation of the first two monolayers were determined with high precision. It is found that the first monolayers act as a precursor for further growth, already resembling the multilayer structure, while a dislocation pattern was identified, which is attributed to the misfit between the locally dense packed film and the substrate lattice.
[1] I. Salzman et al., ACS Nano (2012), 6, 10874

[2] R. Félix et al., Cryst. Growth Des., Article ASAP, DOI:

  10.1021/acs.cgd.6b01117