Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and Other
O 49.6: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/EG
Adsorption and Electronic Properties of N-Heteropolycycles on Metal Surfaces — •Felix Landwehr1, Mohsen Ajdari1, Marvin Hoffmann2, Hilmar Reiss3, Hendrik Hoffmann3, Uwe H. F. Bunz3, Andreas Dreuw2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg — 2Interdisziplinäres Zentrum für Wissenschaftliches Rechnen, Ruprecht-Karls-Universität Heidelberg — 3Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg
Introduction of nitrogen atoms into the π-electron backbone of polycyclic hydrocarbons lowers the energy of the frontier orbitals and accordingly increases the electron affinity, while the optical gap remains almost constant. Thus, N-heteropolycycles possess a higher stability compared to the corresponding polyaromatic hydrocarbons.
Due to the increased electron affinity, aromatic N-heteropolycyclic compounds are n-type semiconductors and thus promising candidates for applications in field effect transistors. However, a detailed understanding of the adsorption and electronic properties of these molecules at interfaces and in thin films is needed to optimize the devices performance.
In this contribution, we used temperature-programmed desorption, electronic and vibrational high-resolution electron loss spectroscopy, as well as scanning tunneling microscopy/spectroscopy to elucidate the adsorption and electronic properties of N-heteropolycycles adsorbed on Au(111).