Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: Organic Thin Films II

DS 27.12: Talk

Wednesday, April 2, 2014, 18:00–18:15, CHE 91

Film Growth, Adsorption and Desorption Kinetics of Indigo on SiO2 — •Boris Scherwitzl, Roland Resel, and Adolf Winkler — Institute of Solid State Physics, Petersgasse 16, A-8010 Graz, Austria

Understanding the initial stages of organic film growth is the first step of manufacturing organic microelectronic devices. Due to hydrogen bonding and π-stacking, unlike most organic materials, the natural dyes indigo and tyrian purple form highly crystalline films with interesting semiconducting characteristics. In this contribution we report our recent efforts and studies on the initial growth behavior of thin indigo films (C16H10N2O2) on a silicon dioxide substrate under UHV conditions with respect to sample treatments. Films from sub-monolayer up to multilayer range were created using physical vapor deposition and subsequently analyzed with Auger Electron Spectroscopy, Thermal Desorption Spectroscopy, Atomic Force Microscopy and X-Ray Diffraction. It could be shown that indigo films tend to dewet at sub-monolayer coverages and form bulk-like structures bound by hydrogen bonds once a certain film thickness is reached. Repeating the measurements on a sputter-cleaned surface and considering heat of evaporation calculations, yields interesting results regarding growth kinetics and surface diffusion.