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SYOO: Organic Optoelectronics and Photonics

SYOO 1: Organic Field-Effect Transistors

SYOO 1.6: Vortrag

Montag, 7. März 2005, 11:00–11:15, TU C130

Spectroscopic investigation of metal-organic contacts for organic electronics — •Achim Schöll, Ying Zou, Sönke Sachs, Matthias Paul, Rainer Fink, and Eberhard U mbach — Experimentelle Physik II, Am Hubland, 97074 Würzburg, Germany

Metal-organic contacts are of crucial importance for all organic electronic applications. The bonding of the organic molecules of the active layer and the metal contact has not only a key influence on the charge carrier transport through the interface but also on the morphology and structure of the organic film near the contact. We characterize this interface bonding for different model molecules (PTCDA, NTCDA, DIP) on Ag(111) and Au(111) surfaces using high-resolution PES and NEXAFS spectroscopy. In all cases the first molecular layer is flat lying. However, the molecules interact stronger with the Ag(111) surface, where PTCDA and NTCDA form different chemisorbed monolayer phases which can clearly be distinguished due to the high quality of the presented XPS data. The bonding is assigned to the interaction of the molecular aromatic pi-system with Ag s- and d-states and significant charge transfer from Ag into the NTCDA/PTCDA LUMO is observed. In contrast, all investigated molecules show mainly physisorptive bonding to the Au(111) surface.