Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.35: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Investigation of the structure and electronic alignment of PTCDI-C13 thin films on metal surfaces — •Daniel Gebauer, Philip Schulz, Dominik Meyer, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, D-52056 Aachen, Germany

N,N'-Ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDIC-13) is a promising acceptor material for organic solar cells. To fully utilize the potential of this material, the growth of thin films of PTCDI-C13 has been studied. Particular attention has been devoted to understanding the electronic and chemical properties of the interface between the organic layer and the metal contact. The interaction between the PTCDI-C13 and the metal strongly influences the charge carrier transport mechanisms and thus the efficiency of the solar cell. In this study thin films of PTCDI-C13 with a thickness varying from single monolayers up to 20 nm, have been evaporated on Au, Ag, Cu and Al surfaces. The energy level alignment between the valence band of each metal and the frontier molecular orbitals of the subsequently deposited organic layer has been determined by Ultraviolet Photoelectron Spectroscopy (UPS). The chemical bonding is investigated by X-ray Photoelectron Spectroscopy (XPS). Finally, the nature of the interaction between the organic layer and the metal surface has been determined from the formation of interface states and the position of the energy levels.