Regensburg 2007 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 5: Organic Interfaces (SYOE 1)

DS 5.1: Vortrag

Montag, 26. März 2007, 14:30–14:45, H32

Structural and morphological study of perylene films grown on different substrates — •Maryam Beigmohamadi, Phenwisa Niyamakom, Azadeh Farahzadi, Stephan Kremers, Christian Effertz, Thomas Michely, and Matthias Wuttig — Institute of Physics (IA), RWTH Aachen University of technology 52056 Aachen, Germany

Recently, organic semiconductors have emerged as a technologically important class of electronic materials. Of particular interest is the morphology and the growth of organic films, deposited on insulating substrates, since this configuration is used in Organic Thin Film Transistors (OTFTs). Key elements for the device performance are the structure of the functional organic layer and the charge injection from the metallic contacts. Therefore, understanding of structural properties and the morphology of organic films deposited on metallic substrate is essential for applications in future devices. Also improved internal ordering of the organic thin film, together with increased electrical conductivity and with reduced activation energy for electrical conductivity could enhance field-effect carrier mobilities. The growth of highly ordered perylene films deposited on oxidized and metallic substrates is studied. By employing Atomic Force Microscopy (AFM) and X-ray Diffraction (XRD), the structure and the morphology of the films are characterized. AFM reveals the existence of dislocation in the grains. From XRD, it has been observed that the perylene films, deposited on Al2O3/Si, have fiber texture ordering in c-axis. However, for perylene films deposited on Au layer the crystalline structure is less developed.