Dresden 2006 – scientific programme

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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.57: Poster

Tuesday, March 28, 2006, 15:00–17:30, P2

Optical and structural properties of perylene films — •Stephan Kremers, Phenwisa Niyamakom, Maryam Beigmohamadi, Azadeh Farahzadi, Thomas Michely, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany

Highly symmetric organic molecules such as perylene tend to grow crystalline which give rise to high carrier mobility. This property makes them feasible for low-cost electronic device. We have therefore investigated the properties of thin films of the perylene deposited on various substrates such as silicon, glass and gold with different deposition rates and film thicknesses. Subsequently their structural properties were measured employing both AFM to determine the film roughness and surface morphology as well as XRD to determine their micro strain, texture and grain size. Finally their optical properties were determined with ellipsometry and UV-VIS spectroscopy. The structure investigation shows that highly textured films with specific defects form above a critical thickness. This has a profound impact on the growth morphology. The combination of AFM and XRD enables the identification of the defects. The highly textured films show a pronounced optical anisotropy. Efforts to simulate this anisotropy are presented.