Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 46: Thin Film Properties: Structure, Morphology and Composition IV
DS 46.5: Talk
Friday, March 20, 2020, 12:15–12:30, CHE 89
Investigation of the interaction of an organic electron donor with graphene — •Joris de la Rie1, Qiankun Wang1, Kathrin Müller1, Wenbo Lu1, Mihaela Enache1, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Institute for Organic Chemistry, University of Heidelberg, Germany
Among others, graphene is widely known for its excellent electronic properties making it an extremely appealing candidate for usage in future (nano)electronic devices. Such applications often require modification of graphene's electronic properties to ensure compatibility with other device components. Deposition of a molecular layer has been shown to controllably modify graphene's work function as well as charge carrier type and concentration.
Here, we report on the self-assembly of the organic donor molecule 2,3,6,7,10,11-hexakis-alkoxytriphenylene (HAT) on graphene on Ir(111). Previous study of this molecule on Ag(111) identified it as a suitable candidate for use in organic electronics[1]. Employing scanning tunnelling microscopy and low energy electron diffraction, we found that these molecules assembled in a hexagonal network at up to monolayer coverages. We used X-ray and ultraviolet photoelectron spectroscopy to investigate the intermolecular and molecule-graphene interactions as well as to monitor changes of the electronic properties of graphene.
[1] Müller et al., Small 2019, 15, 1901741