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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.17: Poster
Tuesday, March 27, 2007, 18:00–20:00, Poster B
Electronic structure of the organic semiconductor blend C60/CuPc — •Andreas Opitz1, Markus Bronner1, Wolfgang Brütting1, Marcel Himmerlich2, Juergen A. Schaefer2, and Stefan Krischok2 — 1Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2Institut für Physikund Institut für Mikro- und Nanotechnologien, TechnischeUniversität Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany
Mixed organic materials are widely used for ambipolar organicfield-effect transistors (OFETs) and photovoltaic cells (OPVCs). One particular material system used in both device types is a blend of n-conducting fullerene (C60) and p-conducting copper-phthalocyanine (CuPc) prepared by co-evaporation.
The electronic properties of these blends deposited on a gold electrode were analysed by X-ray and ultraviolet photoelectron spectroscopy in dependence on the mixing ratio. The energies of the highest occupied molecular orbitals (HOMO), the core levels and the vacuum level are found to vary with the mixing ratio. This energy shift is related to the common work function in the molecular blend which varies linearly with the mixing ratio between the values of the neat materials. As reported in the literature for layered systems there is no evidence for a chemical reaction of these two materials in blend systems.