Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks
O 73.9: Talk
Wednesday, March 18, 2020, 17:15–17:30, TRE Phy
2D molecular Self-assembly of C8-BTBT on metallic surfaces — •Sebastian Becker1,2, Lu Lyu1, Sina Mousavion1, Maniraj Mahalingam1, Benjamin Stadtmüller1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Department of Chemistry, University of Kaiserslautern, Erwin-Schrödinger-Str. 52, 67663 Kaiserslautern, Germany
Owing to a unique high mobility, [1]Benzothieno[3,2-b]benzothiophene (BTBT) based organic semiconductors (OSCs) have an enormous potential for photonic and spintronic applications. Here we systematically investigate the self-assembly of 2,7-Dioctyl-BTBT (C8-BTBT) molecules on Cu(111), Cu(001) and Co/Cu(001) surfaces. In the first monolayer, C8-BTBT molecules adopt a flat lying geometry on these surfaces due to dominant molecule-metal interactions. Depending on sample temperature, various C8-BTBT phases with different unit cells are found on Cu(111), in which the molecular C8-arms rotate into different orientations. On the more reactive surface of a Co thin film on Cu(100), a chemical desulfurization is observed in the first layer of C8-BTBT in contrast to the adsorption of C8-BTBT directly on Cu(001). The desulfurization reaction blocks the electron transfer across the interface. Our findings will provide new insight into the structural and electronic properties of BTBT-derivatives on metallic surfaces