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O: Fachverband Oberflächenphysik
O 40: Organic Molecules on Inorganic Substrates III: Electronic, Optical and other Properties
O 40.10: Vortrag
Dienstag, 17. März 2020, 12:45–13:00, REC C 213
Adsorption and Electronic Properties of Azaacenes on Au (111) — •Mohsen Ajdari1, Friedrich Maass1, Matthias Müller2, Hilmar Reiss2, Marvin Hoffmann3, Uwe H. F. Bunz2, Andreas Dreuw3, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut — 2Organisch-Chemisches Institut — 3Interdisziplinäres Zentrum für Wissenschaftliches Rechnen, Ruprecht-Karls-Universität Heidelberg
Azaacenes are organic electron-transporting semiconductors that belong to N-heteropolycyclic aromatic compounds, which are promising candidates for a variety of (opto) electronic applications such as field effect transistors. In these molecules, introduction of nitrogen in their aromatic backbone in its pyridine form decreases the energy of both HOMO and LUMO, resulting in an improved stability due to an increased ionization potential and electron affinity of organic semiconductor.
In this study, we investigated the adsorption and electronic properties of azaacenes as a function of coverage on Au (111) by employing temperature-programmed desorption (TPD), vibrational and electronic high-resolution electron energy loss spectroscopy (HREELS) in combination with quantum-chemical theory to gain detailed insights into their adsorption geometry and electronic structure on Au(111) which is of great importance for optimizing and improving a device performance.