Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 16: 2D materials: Graphene and BN (joint session HL/DS)
DS 16.4: Vortrag
Dienstag, 13. März 2018, 14:45–15:00, A 151
Graphene Nanoribbons on Hexagonal Boron Nitride: Deposition and Transport Characterization — Christian Kick1, Andreas Lex1, •Tobias Preis1, Akimitsu Narita2, Kenji Watanabe3, Takashi Taniguchi3, Klaus Müllen2, Dieter Weiss1, and Jonathan Eroms1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Regensburg, Germany — 2Max Planck Institute of Polymer Research, Mainz, Germany — 3National Institute for Materials Science, Tsukuba, Japan
We contacted cove-type graphene nanoribbons (cGNRs) of different widths (4 and 6 carbon dimers) with different metals (NiCr-Au and Pd) and measured their I-V-characteristics. The cGNRs were chemically synthesized and are solution processable in THF or chlorobenzene after sonification (see [1] for the synthesis). This solution was subsequently drop-cast onto exfoliated hexagonal boron nitride (hBN) on an SiO2 wafer. With AFM we observe the formation of ordered cGNR domains that are aligned along the crystallographic axes of the hBN. With electron beam lithography and metalization, we successfully contacted the cGNRs with NiCr-Au and Pd contacts and measured their I-V-characteristics. The transport through the ribbons was dominated by the Schottky behavior of the contacts between the metal and the ribbon. We could not observe any gate dependence so far which could be due to screening effects of the metal contacts.
[1] A. Narita, et al., Nature Chemistry 6, 126 (2014).