Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Metal substrates: Adsorption of organic / bio molecules VI

O 49.1: Talk

Wednesday, March 16, 2011, 15:00–15:15, PHY C213

Investigation of the CuPc/PTCDA interface on Ag(111) — •Benjamin Stadtmüller, Ingo Kröger, Christoph Kleimann, Tamoki Sueyoshi, Sergey Subach, and Christian Kumpf — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany and JARA-Fundamentals of Future Information Technology

One crucial issue for improving organic electronics is the understanding of interfaces between different functional materials. While recently interfaces between metal contacts (i.e., noble metal surfaces) and active organic layers were investigated intensively, only few studies so far focused on the interface between different organic materials. In this context we investigated the adsorption of copper-II-phthalocyanine (CuPc) on a closed monolayer of perylen-tetracarboxylicacid dianhydride (PTCDA) on Ag(111). Using high resolution low energy electron diffraction (SPA-LEED) we could show that at room temperature the CuPc molecules form a diluted, disordered layer, similar to the case of direct adsorption on Ag(111). Upon cooling (<-150°C) or increasing coverage (close to one monolayer) phase transitions to ordered structures occur. These ordered phases are compared with the adsorption of CuPc on Ag(111) in first and second layer. Furthermore, UV photoemission experiments are reported, which allow to reveal the electronic properties of the interfaces. The experiments nicely demonstrate the strong impact of structure and composition of the first adsorbate layer (which is in direct contact to the Ag surface) on the properties of the second molecular layer.