Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.39: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Study of the electronic properties of cobalt phthalocyanine thin films on poly- and single crystalline gold substrate by photoemission spectroscopies — •Fotini Petraki, Heiko Peisert, and Thomas Chassé — Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, D-72076 Tübingen, Germany

Organic electronics is a new and fast developing sector of microelectronics which aims either to cover applications that are not accessible to conventional silicon semiconductor technology or to decrease the cost of the devices with the use of organic materials. In organic devices, the interfaces between the electrodes and the organic films play an important role, as they determine the injection efficiency by establishing barriers for carrier injection in the organic active layer. Therefore, interface studies contribute to the understanding and improvement of the device performance. In the present study, model experiments concerning the interface formation between Cobalt Phthalocyanine (CoPc) ultra thin films and gold substrate were carried out by X-ray and Ultra-Violet photoelectron spectroscopies (XPS, UPS) as well as Auger spectroscopy (XAES). The experimental data indicate a quite strong interaction between the organic molecules and the metallic substrate, which is confirmed by the presence of additional features at the characteristic Co2p and CoLVV peaks of the CoPc film at the very first steps of deposition. The valence band structure of CoPc is well resolved while new features are also present for monolayer coverage. Screening mechanisms in XPS and XAES are also discussed.