Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 45: Organische Dünnschichten IV

O 45.8: Vortrag

Dienstag, 8. März 2005, 17:30–17:45, TU EB301

Growth and electronic structure of pentacene films deposited on polycrystalline gold surfaces — •V. Yanev, Ch. Weis, M. Himmerlich, S. Krischok, M. Eremtchenko, and J.A. Schaefer — Institut für Physik und Zentrum für Mikro- und Nanotechnologien, TU Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany

Pentacene is a promising material for organic thin film transistors due to its high carrier mobilities. Therefore, for organic electronics, it is of great interest to gain a basic understanding of the pentacene growth on evaporated or sputtered metal films, similar to the contacts in electronic devices. We examined the structure and electronic properties of pentacene films on evaporated gold surfaces. The molecular layer structure was investigated using atomic force microscopy (AFM). An upright molecular orientation was observed. The structure of the films is compared to that of pentacene grown on Ag(111). The dependence of the grain size on the deposition conditions is discussed. The electronic structure of the molecular-metal interface was investigated using X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS).