Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Organic-Inorganic Systems IV: Electronic Structure
O 85.3: Vortrag
Donnerstag, 10. März 2016, 15:45–16:00, S051
Structural and electronic properties of organic charge-transfer complexes on Ag(111) — •Kathrin Müller1,2, Nico Schmidt1, Michael Grunst3, Rene Riedel3, Milan Kivala3, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3Department of Chemistry and Pharmacy, University Erlangen-Nürnberg, Germany
The use of organic molecules in electronic devices is gaining increasing interest due to their low cost, flexibility and easy processability. However, organic molecules often show weak intermolecular interactions limiting the electron mobility of organic films. One way to overcome these problems is the use of complementary molecules, which exhibit a strong intermolecular interaction. We employ molecules with complementary functional groups as well as complementary building blocks, e.g. by using electron rich and electron poor building blocks. In this work, we studied the self-assembly and the electronic properties of two molecules containing cyano- and methoxy-groups, respectively, on a Ag(111) surface. The cyano-functionalized molecule exhibits a high electron affinity, while the other one shows a low ionization potential. The investigations of the structural and electronic properties of the individual species as well as the mixed layer were carried out by scanning tunneling microscopy and spectroscopy, X-ray and ultraviolet photoelectron spectroscopy and low-energy electron diffraction. We found that the electronic properties of the mixed layer are changed with respect to the assemblies containing one molecular species.