Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Organic-Inorganic Hybrid Systems and Organic Films IV

O 29.2: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, WIL A317

Adsorbate-Induced Charge Accumulation and Collective Excitations at Metal/Organic Interfaces — •Friedrich Maaß, David Gerbert, and Petra Tegeder — Physikalisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg, INF 253, 69120 Heidelberg, Germany

The electronic and geometrical structure of organic molecules at metal/organic interfaces have substantial impact on the performance of organic molecule-based devices. We investigated the adsorption geometry and the electronic properties of F4TCNQ and TCNQ on the Au(111) surface using vibrational and electronic high-resolution electron energy-loss spectroscopy (HREELS), temperature-programmed desorption (TPD), and density functional theory calculations (DFT). With angle-resolved electronic HREELS we characterized a collective excitation of electrons accumulated at the interface[1]. We analyzed the influence of transferred parallel momentum, impinging electron energy, and film thickness. As F4TCNQ is, in contrast to TCNQ, known to be negativly charged at the Au(111) surface we were also able to investigate the influence of charges in the adsorbate layer on the collective excitation.

[1] Salomon, E., Layet, J. M., and Angot, T. Phys. Rev. B, 85, 125420 (2012).

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