Berlin 2012 – scientific programme

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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 44.38: Poster

Friday, March 30, 2012, 09:30–12:00, Poster E

Ultrathin oligothiophene films for organic electronics applications — •Nina Arzt¹, Benedikt Rösner¹, Andreas Späth¹, Norman Schmidt¹, Hannes Schulz², and Rainer Fink¹ — ¹Universität Erlangen-Nürnberg, Department Chemie u. Pharmazie, Physikalische Chemie II, Egerlandstr. 3, 91058 Erlangen, Germany — ²Universität Erlangen-Nürnberg, Department Chemie u. Pharmazie, Theoretische Chemie, Egerlandstr. 3, 91058 Erlangen, Germany

Oligothiophenes are attracting major attention due to their potential application as semiconducting material for cheap, flexible and large-area electronic devices such as organic field effect transistors [1]. For their successful preparation homogenous and highly ordered thin films of the semiconductor material are required. We have successfully studied two different kinds of oligothiophenes with respect to their local arrangements. From low-energy electron diffraction (LEED) we deduce long-range ordered films of flat-lying molecules when deposited on Ag(100) single crystals. In contrast, the utilization of Si3N4 membranes, small domains are observed in scanning transmission X-ray microspectroscopy (STXM). Furthermore, NEXAFS studies using the PolLux-STXM installed at the Swiss Light Source offers more direct insight into the electronic structure of these microcrystalline films. We discuss the crystal growth properties considering the specific interface interactions. The work is funded by the BMBF, project 05 K10WEA.

[1] M. Halik, H. Klauk, U. Zschieschang, G. Schmid, S. Ponomarenko, S. Kirchmeyer, W. Weber, Adv. Mater., 2003, 15, 917-922.