Berlin 2008 – scientific programme
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.38: Poster
Tuesday, February 26, 2008, 14:30–19:30, Poster A
Vibrational Study of Free-Base Tetraphenylporphyrin Films — •Simona Dorina Pop, Dana Maria Rosu, Karsten Hinrichs, and Norbert Esser — ISAS-Institute for Analytical Sciences, Department Berlin, Albert-Einstein Str. 9, D-12489, Berlin, Germany
The vibrational structure of the vacuum deposited free-base meso-tetraphenylporphyrin (H2TPP) films on silicon substrates is investigated by infrared spectroscopic ellipsometry. The dielectric function of the H2TPP films is determined in the mid-infrared energy range. The H2TPP films exhibit a uniaxial structure in agreement with the results obtained by spectroscopic ellipsometry performed in the visible energy range. The orientation of the H2TPP molecules on silicon substrates as well as the thickness dependence of the IR dielectric function are analyzed. The assignment of the observed vibrational bands is performed with the help of density functional theory method.