Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Inorganic/Organic Interfaces: Electronic Properties I

O 43.9: Talk

Wednesday, March 18, 2015, 12:45–13:00, MA 005

Heteromolecular CuPc-C60 monolayer films on the Co(1000) surface — •Norman Haag, Johannes Seidel, Johannes Stöckl, Benjamin Stadtmüller, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

Heteromolecular monolayer films consisting of two different types of molecules are promising candidates for tailoring the geometric and electronic properties at metal-organic hybrid interfaces. So far, this approach has only been demonstrated on noble metal surfaces where the molecules show a weak chemical molecule-substrate interaction [B. Stadtmüller, Nat. Commun. 5, 3685 (2014)]. In this study, we extend this concept to ferromagnetic surfaces by investigating the formation of heteromolecular CuPc-C60 structures on the Co(1000) surface. On such transition metal surfaces, the strong molecule-substrate interaction usually prevents the formation of long-range ordered molecular structures. We have studied the electronic and structural properties of the heteromolecular CuPc-C60/Co(1000) system using a k-space photoemission microscope. Analyzing the angular dependent photoemission pattern allows us to assign spectroscopic features to molecular orbitals and to determine the orientation of corresponding molecules on the surface. A comparison of these results to the CuPc and C60 homomolecular films on Co(1000) reveals that the formation of ordered heteromolecular films is mainly caused by a site-specific interaction of C60 with Co.