Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Organic Thin Films, Organic-Inorganic Interfaces II (joint session DS/CPP)

DS 17.3: Talk

Tuesday, March 17, 2020, 11:45–12:00, CHE 91

Tuning the electronic properties of graphene with periodically arranged metal-organic coordination networks — •Qiankun Wang, Brian D. Baker Cortés, Joris de la Rie, Mihaela Enache, and Meike Stöhr — Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

Here, we investigate by means of scanning tunneling microscopy and photoelectron spectroscopy how the electronic properties of graphene are modified upon deposition of 5,10,15,20-tetra(4-pyridyl)porphyrin (2HTPyP) with and without coordination to Co atoms. Graphene was prepared on two different substrates, namely Cu(111) and CuOx, and it has been reported to be n-type doped on Cu(111) and quasi-freestanding on CuOx. Thereby, a comparison how the molecular adsorption changes the electronic properties of doped/undoped graphene could be done. We will discuss (i) the transition of the H-bonded self-assembled 2HTPyP network into a long-range ordered metal-organic coordination network (MOCN) upon Co deposition and (ii) the electronic level alignment at the graphene/MOCN interface and how this is influenced by the underlying substrate. Our study provides a viable possibility for the usage of graphene as a charge and spin transport material in future electronic and spintronic applications.