Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.7: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Growth of CuPc thin films and metal contact formation: A photoemission study — •Teodor Toader1, Gianina Gavrila2, Jan Ivanco1, Walter Braun2, and Dietrich R.T. Zahn1 — 1Department of Physik, Technical University Chemnitz, D-09107 Chemnitz, Germany — 2BESSY GmbH, Albert-Einstein-Straße 15, D-12489 Berlin, Germany
In this study both organic/inorganic semiconductor and metal/organic film interfaces prepared under ultra-high vacuum conditions will be addressed. The growth of highly-ordered copper phthalocyanine (CuPc) films on stepped Si(111) surfaces was investigated by photoemission and near edge X-ray absorption fine structure (NEXAFS). While the molecules take an upright orientation on hydrogen-passivated surfaces, the passivations by an ultra-thin antimony layer lead to a near lying molecular orientation. The molecular geometry in the CuPc film grown on the hydrogen-Si(111) surface was significantly influenced using a template film of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) deposited prior to CuPc growth. Varying molecular orientation in the CuPc films affects their electronic properties as probed via valence band photoemission spectroscopy. The interfacial chemistry and electronic structure of a metal contact, namely In-CuPc was studied during the incremental overgrowth of indium. A chemical interaction between indium and CuPc film was detected with reacted molecules tending to remain on the In surface, rather than at the In-CuPc interface.