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Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 46: Organic Thin Films III

DS 46.1: Talk

Friday, March 26, 2010, 14:00–14:15, H8

Role of the substrate in electronic structure, molecular orientation, and morphology of organic thin films: diindenoperylene on rutile TiO2(110) — •Maria Benedetta Casu, Britt-Elfriede Schuster, Indro Biswas, and Thomas Chassé — IPTC, University of Tübingen, Tübingen, Germany

Diindenoperylene (DIP, C32H16) is a perylene-based molecule that shows a very high hole mobility already in thin films, good film forming properties, and thermal stability. Sample preparation and photoemission experiments (X-ray photoelectron spectroscopy, XPS) were carried out in an ultrahigh vacuum system, The Ti 2p core level photoemission spectrum showed only a very weak low binding energy shoulder usually attributed to surface non-stoichiometry due to oxygen vacancies (3-5 % in our clean substrates). Atomic force microscopy (AFM) measurements were performed under ambient conditions in tapping mode. Near edge X-ray absorption spectroscopy (NEXAFS) measurements were performed at the beamline UE52-PGM at BESSY (Berlin). The results of our multitechnique investigation performed on diindenoperylene thin films deposited on rutile TiO2(110) show island growth, with crystallites nucleating preferentially along the [1-10] substrate crystallographic axis. The findings evidence that the film properties at the interface are common to what found for a number of organic molecules deposited on the same substrate, revealing that the structural and morphological properties of organic thin films on rutile TiO2(110) are essentially driven by its surface topography, with its rows of bridging oxygen atoms, while the molecular properties are less relevant.

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