Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.31: Poster

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

On the Role of the Interface on the Growth of a Stabilized Bilayer Framework System — •Alexander Mänz, Michael Kothe, and Gregor Witte — Molekulare Festkörperphysik, Fachbereich Physik, Philipps-Universität Marburg, Renthof 7, 35032 Marburg

The nonplanar, π-conjugated PAH titanyl-phthalocyanine (TiOPc) is known for exceptional optical and electronic properties. To utilize and optimize TiOPc based thin film devices a detailed understanding of interface related growth is of great importance. This study links characteristics of inital growth of the TiOPc bilayer framework, deposited via organic molecular beam deposition (OMBD) with the morphology of TiOPc multilayer systems on various substrates. In a first step, the molecular arrangement of TiOPc on Au(111) and Ag(111) substrates from monolayer to multilayer regime is characterized by scanning tunneling microscopy (STM). Consecutively, we analyze the morphology and crystallinity of TiOPc multilayers by means of atomic force microscopy (AFM) and X-ray diffraction (XRD). After completion of the first bilayer on Au and Ag substrates, dewetting leads to formation of separated islands with height of multiples of the bilayer, which are stabilized by the alternating orientation of the titanyl units. Comparative analyses for thin films grown on KCl and HOPG substrates show a similar behaviour, while somewhat different polymorphs were identified in thicker films.