Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering
O 77.9: Talk
Thursday, April 4, 2019, 12:30–12:45, H9
Adsorption and Electronic Properties of N-Heteropolycyclic Molecules on Metal Surfaces — •Mohsen Ajdari1, Friedrich Maass1, Matthias Müller2, Christoph Hendrich2, Uwe H. F. Bunz2, A. Stephen K. Hashmi2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Universität Heidelberg — 2Organisch-Chemisches Institut, Universität Heidelberg
Small molecule organic semiconductors based on N-heteropolycyclic aromatic compounds are promising candidates for a variety of (opto) electronic applications. 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, while the optical gap remains almost constant.
Understanding the adsorption and electronic properties of these molecules on inorganic substrates provides important insights into the charge transfer properties at organic/inorganic interface. High resolution electron energy loss spectroscopy (HREELS) is a powerful tool for investigating both the adsorption geometry via vibrational excitations and electronic properties of the molecules by utilizing electrons with sufficient energy to excite electronic transitions. In this study, HREELS is used to determine the adsorption and electronic properties of a new class of N-heteropolycyclic molecules as a function of coverage on Au(111).