Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 50: Poster Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 50.2: Poster
Tuesday, March 18, 2025, 18:00–20:00, P2
Coverage-dependent assembly of functionalized helicenes — •Elise Fürch1, Jonas Brandhoff1, Fumi Nishino2,3, Keisuke Fukutani2,3, Marco Gruenewald1, Maximilian Schaal1, Felix Otto1, Roman Forker1, Takashi Hirose4, Satoshi Kera2,3, and Torsten Fritz1 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Institute for Molecular Science, Myodaiji, 444-8585, Okazaki, Japan — 3The Graduate University of Advanced Studies, Hayama-cho, 240-193 Kanagawa, Japan — 4Institute of Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
Recently, the interest in chiral molecules has spiked. The chirality-induced spin selectivity (CISS) promises a high spin-polarizability for electrons traversing a chiral molecule. However, the CISS effect is yet not fully understood. To be able to probe the CISS effect with area averaging methods like photoelectron spectroscopy a well-defined chiral thin film, consisting of helical molecules, is needed. In this study the chiral molecule thiadiazole[9]helicene (TD[9]H) is investigated on Au(111) and Ag(111) surfaces. To understand how chirality from one single molecule evolves into a fully chiral overlayer, a coverage dependent study, showing different structural motifs of TD[9]H, was performed. This structural evolution was investigated using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). In combination, these methods reveal a chiral lattice, and the role of the different molecule-molecule and molecule-substrate interactions will be discussed.
Keywords: Chirality; Helicenes; STM; LEED; DFT