Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.1: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Charge transport in bottom-up synthesized graphene nanoribbon networks — Alexander Tries1,2,3, •Leo Schnitzspan1, Nils Richter1, Zongping Chen2, Kamal Asadi3, Akimitsu Narita3, Klaus Müllen3,4, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg Universität Mainz — 2Graduate School of Excellence Materials Science in Mainz — 3Max Planck Institute for Polymer Research — 4Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz
Graphene nanoribbons (GNRs) attract attention due to particular physical properties resulting from the geometrical confinement, and these also depend crucially on both width and edge morphology [1]. Using GNR field-effect transistors, we perform a systematic study on the electronic properties of chemically synthesized and atomically perfect armchair GNRs with a width of 5 and 9 carbon atoms (5-AGNR and 9-AGNR)[2]. Our measurements reveal nuclear tunneling-assisted charge carrier hopping [3] as the dominant charge transport mechanism allowing us to apply a universal scaling law valid for charge transport in networks of both GNR structures over a large range of driving voltages and temperatures. Gate-dependent measurements show a pronounced hysteretic effect and we identify the origin of this hysteresis by temperature dependent measurements[4,5].
[1] Son et al., Phys.Rev.Lett.97, 216803 (2006). [2] Z. Chen et al., J.Am.Chem.Soc., 139, 9483-9486 (2017). [3] K. Asadi et al., Nat.Commun. 4:1710 (2013). [4] N. Richter et al., arXiv:1806.00962 [5] A.Tries et al., submitted (2018)