Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 47.9: Poster
Tuesday, March 8, 2016, 18:15–20:30, Poster E
Investigation of the Potassium-Doping of Tetraphenyldibenzoperiflanthene (DBP) on Ag(111) by Photoelectron Spectroscopy — •Felix Otto, Christian Udhardt, Tino Kirchhuebel, Bernd Schroeter, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany
Tetraphenyldibenzoperiflanthene (DBP, C64H36) has been explored for some years because of its possible use in organic electronics [1]. DBP consists of an aromatic backbone with four phenyl rings attached nearly perpendicular to the molecular plane. We analysed the change of electronic properties due to the doping process of this organic dye with potassium. Special attention is paid to the possible adsorption sites of the potassium atoms in the organic/inorganic heterosystem. We used in situ differential reflectance spectroscopy (DRS) to determine changes of the optical properties due to the potassium deposition [2, 3]. These results are compared with x-ray (XPS) and ultraviolet photoelectron spectroscopic (UPS) measurements to elucidate the charge transfer between the alkali metal and DBP. Furthermore effects on the electronic structure are discussed in terms of lowest unoccupied molecular orbital (LUMO) filling and the evolution of an interface dipole.
[1] J. D. Debad et al., J. Am. Chem. Soc. 118, 2374 (1996).
[2] R. Forker and T. Fritz, Phys. Chem. Chem. Phys. 11, 2142 (2009).
[3] R. Forker et al., Annu. Rep. Prog. Chem., Sect. C: Phys. Chem. 108, 34 (2012).