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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 Chassé¹ — ¹Institut 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.