Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.6: Poster

Mittwoch, 24. März 2010, 15:00–17:30, Poster A

In-situ Optical Spectroscopy During the Growth of Phthalocyanine Thin Films on Single Crystalline Substrates — •Enno Lorenz¹, André Dragässer¹, Christopher Keil¹, Jens Wallys², Martin Eickhoff², and Derck Schlettwein¹ — ¹Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de — ²Experimental Physics I, Justus-Liebig-University Giessen, Germany.

Thin films of differently substituted metal phthalocyanines were grown on alkali halide (NaCl, KCl and KBr) 001 faces and on wurtzite GaN 0001 on sapphire by physical vapor deposition. The films were studied during growth from the monolayer thickness regime to an average film thickness of 100 nm. Since phthalocyanines are characterized by a large oscillator strength of the electronic transition following absorption of visible light and by strong intermolecular dipole coupling of the transition dipoles in the solid state, optical measurements are well suited to study the development of intermolecular coupling and crystal structure during film growth. In- situ optical analysis was performed in transmission geometry perpendicular to the molecular deposition beam to achieve sub- monolayer sensitivity. The results are discussed in context of structural and morphological characteristics of the observed films.