Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: Organic molecules on inorganic substrates: electronic, optical and other properties – Poster
O 46.2: Poster
Tuesday, March 10, 2026, 14:00–16:00, P2
On-Surface Reaction of Naphthothiadiazole Derivatives on Au(111) — •Mohsen Ajdari1, Jakob Steidel1, Larissa Winkelmann1, Felix Landwehr1, Jakob Sawatzki1, Jakob Roth1, Christian Huck1, Hendrik Hoffmann2, Uwe H. F. Bunz2, and Petra Tegeder1 — 1Institute for Physical Chemistry — 2Institute for Organic Chemistry, Heidelberg University, Germany
Naphthothiadiazole (NTD) and its halogenated derivatives (NTD-Br/Cl) are promising electron acceptor candidates for use in (opto)electronic applications.
In a multi-technique approach, this study utilizes scanning tunneling microscopy, two-photon-photoemission spectroscopy, and temperature-programmed desorption to identify on-surface reactions of adsorbed NTD-Br/Cl on Au(111).
Our findings suggest that the halogenated molecules undergo temperature (NTD-Br) and photo-induced (NTD-Br/Cl) dehalogenation reactions. As a result, we found work function changes, differences in the energy-level alignment as well as changes in the adsorption structure.
Keywords: Naphthothiadiazole; On-Surface Reaction; STM; Two-Photon-Photoemission Spectroscopy; Temperature-Programmed Desorption