Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.27: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

Diindenoperylene film formation on Cu(111) — •Hazem Aldahhak, Wolf Gero Schmidt, and Eva Rauls — Universität Paderborn, Warburger Str. 100, 33098 Paderborn

The formation of diindenoperylene (DIP) thin films on metal substrates has been intensively investigated in the context of the miniaturization of organic optoelectronic devices, due to the high charge carrier mobilities, good film forming properties and thermal stability of the molecules [1, 2]. Thereby an interesting, terrace *width dependent adsorption characteristics has been observed on Cu(111): On narrow terraces (<15nm), the DIP molecules assemble in a co-directionally oriented adsorption pattern, the symmetry of which is not dictated by the hexagonal substrate symmetry [3]. On wider terraces, in contrast, completely different adsorption patterns with a short-range order determined by the underlying substrate are observed. We performed first principles calculations and investigated the balance between intermolecular and molecule-substrate interactions of DIP molecules on planar surfaces and near step-edges. A detailed analysis of the potential-energy surface is presented. Our calculations show a strong influence of the substrate on the geometric and the electronic properties of single molecules and indicate an important role of the step-edges for molecular self-assembly and film growth.

[1] Zhang et al., Surface Science, 603(2009) 3179. [2] De Oteyza et al., Journal of Physical Chemistry C 112, 18 (2008) 7168. [3] De Oteyza et al., Phys. Chem. Chem. Phys. 11, 8741 (2009).