Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Inorganic/Organic Interfaces: Electronic Properties II
O 55.9: Vortrag
Mittwoch, 18. März 2015, 17:15–17:30, HE 101
Adsorption and electronic properties of tetraazaperopyrene derivatives on Au(111) — •Friedrich Maaß1, Stephan Stremlau1, Lena Hahn2, Lutz H. Gade2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany — 2Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany
The adsorption behavior of large N-heterocyclic pi-conjugated molecules is of immense interest for understanding the structural and electronic properties of this new class of organic n-channel semiconductors.
We investigated the adsorption geometry and the electronic properties of 1,3,8,10-tetraazaperopyrene (TAPP) and its 2,9-bisperfluoroalkyl-4,7,11,14-tetra-X derivatives (X is H, Cl, Br or I) on the Au(111) surface with vibrational and electronic high resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). We found a different adsorption behavior between substituted and unsubstituted TAPP and also between monolayer and corresponding multilayers. HOMO-LUMO gaps have been investigated by electronic HREEL spectroscopy and are in good agreement with previously made UV/VIS and calculated data.