Dresden 2017 – scientific programme

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PV: Plenarvorträge

PV XXIII

PV XXIII: Plenary Talk

Thursday, March 23, 2017, 14:00–14:45, HSZ 01

Bottom-up fabrication of graphene nanoribbons: From molecules to devices — •Roman Fasel — Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

Graphene nanoribbons (GNRs) are promising candidates to overcome the low on/off-behaviour of graphene - a zero band gap semiconductor - while still preserving high charge carrier mobility that is essential for the fabrication of efficient field effect transistors. It has been shown that atomically precise GNRs can be fabricated by an on-surface synthesis approach [Nature 466, 470 (2010)]. This versatile method has been successfully applied to the fabrication of armchair GNRs (AGNRs) of different widths - and thus different band gaps - as well as more complicated structures like chevron GNRs or heterojunctions [Adv. Mater. 28, 6222 (2016)]. Most recently, it has also been extended to afford the fabrication of GNRs with zigzag edges (ZGNRs), which are predicted to exhibit spin-polarized edge states.

In a first part of this presentation, I will briefly review the on-surface synthesis approach to GNRs and discuss some recent additions to the family of GNRs including atomically precise 6-ZGNRs [Nature 531, 489 (2016)], GNRs with chiral or cove edges, as well as GNR heterostructures incorporating tunable quantum dots. In the second part, I will address some of the challenges related to the technological application of GNRs, in particular regarding GNR fabrication scalability and device fabrication. Recent results on GNR field effect transistors with high performance will be discussed.