SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Poster Session I: Organic molecules on inorganic substrates: Adsorption and growth I
O 6.2: Poster
Montag, 1. März 2021, 10:30–12:30, P
An organic electron donor on epitaxial graphene: the role of the metal support — •Joris de la Rie1, Mihaela Enache1, Qiankun Wang1, Wenbo Lu1, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Institute for Organic Chemistry, University of Heidelberg, Germany
Graphene has been the first of many 2D materials with excellent electronic properties which make it a material of great interest for future (nano)electronic devices. Implementation of graphene in devices requires interfacing graphene with other materials and tuning of the energy level alignment at the interface. The support on which graphene is placed affects its structural and electronic properties, and further modification is possible through the deposition of thin molecular films which have been shown to modify charge carrier type and concentration. Furthermore, the effect the support has on graphene (corrugation and doping) affects the molecular self-assembly and graphene-molecule interactions. Herein, we compare the self-assembly of an organic triphenylene-based donor (HAT) deposited on graphene on two supports: p doped graphene physisorbed on Ir(111) and n doped graphene chemisorbed on Ni(111). Using scanning tunneling microscopy and low energy electron diffraction we find that on both supports, HAT molecules assemble in a hexagonal network commensurate with the graphene lattice. We used X-ray and ultraviolet photoemission spectroscopy to study modifications of the electronic properties of graphene as well as intermolecular and molecular-graphene interactions.