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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.58: Poster

Dienstag, 28. März 2006, 15:00–17:30, P2

Perfluorinated and nonfluorinated Vanadyle Phthalocyanine on gold - interface properties of two dipolar materials — •Indro Biswas1, Heiko Peisert1, Kanai Kaname2, Nakano Tomohito2, Seki Kazuhiko2, Danilo Dini3, Michael Hanack3, and Thomas Chassé11Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany — 2Nagoya University, Graduate School of Science, Division of Materials Science, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan — 3Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany

The interface properties of vanadyle phthalocyanine (PcVO) and its perfluorinated derivative (F16PcVO) on gold are compared to the corresponding copper phthalocyanines (PcCu, F16PcCu), using photoemission spectroscopy and Kelvin probe measurements. Similarly to F16PcCu, the ionisation potential of F16PcVO is more than 1 eV higher than of the unsubstituted material, and thus a downward (PcVO) or upward (F16PcVO) energy shift is observed. Due to their nonplanar molecular shape both vanadyle phthalocyanines have permanent dipoles. The molecular dipole moment of F16PcVO is influenced by the high electronegativity of the substituting fluorine atoms. For the understanding of energetic shifts at the metal-organic interface the orientation of molecular dipoles is crucial. Different growth modes and π-π interactions are discussed.

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DPG-Physik > DPG-Verhandlungen > 2006 > Dresden