Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Surface State Spectroscopy II
O 16.11: Vortrag
Montag, 7. März 2016, 17:30–17:45, H4
Interdependence of adsorption site and charge distribution in a single donor-acceptor molecule adsorbed on an ionic crystal — •Tobias Meier1, Rémy Pawlak1, Shigeki Kawai1, Shi-Xia Liu2, Yan Geng2, Prokop Hapala3, Pavel Jelínek3, Alexis Baratoff1, Silvio Decurtins2, Ernst Meyer1, and Thilo Glatzel1 — 1Department of Physics, University of Basel, Switzerland — 2Department of Chemistry and Biochemistry, University of Bern, Switzerland — 3Institute of Physics, Academy of Sciences of Czech Republic, Prague, Czech Republic
Electron donor-acceptor molecules are promising candidates for molecular electronic devices since they may generate separated electron-hole pairs upon absorption of photons or rectify electrical currents. Relevant properties of such complexes do not only depend on their intrinsic donor-acceptor character, but can also be modified by their interaction with the underlying surface. We used TTF-dppz [1], a fused pi-conjugated donor-acceptor molecule, deposited on insulating NaCl films on Cu(111). To investigate the interplay between the atomic structures of TTF-dppz and NaCl, we performed high-resolution STM and AFM measurements at 5 K. The charge distribution above individual molecules has been studied by local contact potential mapping [2,3]. We observed two different charge distributions which strongly depend on the adsorption site of the molecule. The results have been correlated with density functional theory calculations. [1] C. Jia et al., Chem. Eur. J. 13, 3804 (2007)., [2] S. Kawai et al., ACS Nano 7, 9098 (2013)., [3] B. Schuler et al., Nano Lett. 14, 3342 (2014).