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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Organic Photovoltaics III

CPP 41.6: Vortrag

Freitag, 27. März 2009, 11:45–12:00, ZEU 222

LEEM and X-PEEM investigations of diindenoperylene on Au(100) — •Maria Benedetta Casu¹, Britt-Elfriede Schuster¹, Tevfik Onur Menteş², Miguel Angel Nino², Andrea Locatelli², and Thomas Chassè¹ — ¹ITPC, University of Tuebingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany — ²Sincrotrone Trieste S.C.p.A., 34012 Basovizza, Trieste, Italy

Diindenoperylene (DIP) thin films can give rise to different film phases depending essentially on the substrate, including its local morphology, and preparation conditions. By using a combination of microscopic imaging and diffraction techniques with structural and chemical sensitivity, we studied the growth of DIP on Au(100), willing to compare the results with what previously obtained on polycrystalline gold. DIP thin films were grown on Au(100) by organic molecular beam deposition at room temperature (RT) and at very low evaporation rate (~ 0.1 Å/min). The growth and structure of DIP films of different thickness was monitored in situ and in real time by LEEM. Our investigations showed the occurrence of a Stranski-Krastanov growth mode, also establishing the influence of the local substrate morphology. Micro-LEED evidenced the different structure of the wetting layer and the islands, confirming a different molecular arrangement depending on the film thickness. Domains of different molecular orientation were identified by dark-field LEEM, following their evolution during growth. In parallel, XPEEM and micro-XPS provided information about the bond between the molecule and the substrate as well as the chemical environment.