Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Organic Molecules at Surfaces 1: Substrate Effects
O 5.7: Vortrag
Montag, 5. September 2022, 12:15–12:30, S051
Comparing adsorption of triphenylene derivatives: metallic vs. graphitic surfaces — •Joris de la Rie1, Mihaela Enache1, Qiankun Wang1, Wenbo Lu1, Nico Schmidt1, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen — 2Institute of Organic Chemistry, University of Heidelberg
Thin films of organic molecules show great promise for applications in future (nano)electronic devices, such as solar cells, light emitting diodes and transistors. A major factor in the performance of these films is the interface between substrate and molecular film. The interfacial properties depend on the balance between intermolecular and molecule-substrate interactions. Herein, we present a comparative study on self-assembled monolayers (SAMs) of a triphenylene-based donor molecule (HAT) on three substrates: Ag(111), graphene/Ir(111) and graphene/Ni(111). We studied the structure of the SAMs by means of scanning tunneling microscopy and low-energy electron diffraction, and their interaction with the substrates by X-ray and ultraviolet photoelectron spectroscopy. On each substrate, HAT formed a close-packed hexagonal network that is commensurate with the substrate. From the photoelectron spectroscopy measurements we only found a weak (physisorptive) interaction between molecules and substrates. This goes against the established belief for SAMs on metal surfaces, where commensurate networks are principally formed on strongly interacting surfaces where the molecules chemisorb.