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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Molecular Electronics and Photonics
CPP 18.7: Talk
Tuesday, March 8, 2016, 11:15–11:30, H42
Organic heterojunctions: Contact-induced molecular reorientation, interface states, and charge re-distribution — •Andreas Opitz1, Andreas Wilke1, Patrick Amsalem1, Ulrich Hörmann2, Ellen Moons3, and Norbert Koch1,4 — 1Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany — 2Institute of Physics, University of Augsburg, Augsburg, Germany — 3Department of Engineering and Physics, Karlstad University, Karlstad, Sweden — 4Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
The planar heterojunction formed between the hydrogen and fluorine terminated copper phthalocyanines has been found to behave as charge generation layer [1]. Therefore, this interface was investigated by ultraviolet photoelectron and X-ray absorption spectroscopy. Pinning at the Fermi level of the underlying electrode is observed for both materials—one p type and the other one n type. This results in a sheet charge density at the organic/organic interface due to interfacial charge transfer. An interlayer with co-facial intermolecular arrangement, which differs from the respective bulk structures, at the interface was found by both spectroscopy techniques; this interlayer, noteworthy, is unpinned.
[1] A. Opitz et al., Org. Electron. 10 (2009) 1259–1267.