Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.39: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Nucleation of Perylene films on SAM-covered Gold Surfaces — •André Pick and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Germany

Previous studies have demonstrated the ability to control the nucleation of organic semiconductor films on a micron scale by patterning of silicon dioxide substrates by means of micro contact printing of self-assembled monolayers. In that way arrays of organic micro-crystallites have been fabricated that are well suited for the fabrication of organic field-effect transistors (OFETS) [1]. It was found that the roughness of stamped domains of the used octadecyltrichlorsilane (OTS), the chemical termination and the mechanical contrast are critical parameters for selective crystal nucleation. To analyze microscopic mechanisms of this nucleation more qualitatively, we have studied the initial stage of growth of perylene (PER) films on gold surfaces that were pre-treated with aliphatic organothiol SAMs of various chain length and different chemical termination. Substrates were coated by the SAMs either homogeneously or selectively by using micro-contact printing. PER films were prepared by molecular beam deposition under vacuum conditions and the resulting film structures were characterized by means of atomic force microscopy. Moreover, to study the influence of substrate roughness these experiments have been carried out on single crystalline Au(111)/mica and poly-crystalline gold substrates. The observed variety of PER structures indicate that the actual film thickness of the thiol layer is an important parameter which will be discussed.

[1] A.L. Briseno et al., Nature Vol. 444, 913 (2006)