Platinum contacts for 9-atom-wide armchair graphene nanoribbons

Abstract

Creating a good contact between electrodes and graphene nanoribbons (GNRs) has been a longstanding challenge in searching for the next GNR-based nanoelectronics. This quest requires the controlled fabrication of sub-20 nm metallic gaps, a clean GNR transfer minimizing damage and organic contamination during the device fabrication, as well as work function matching to minimize the contact resistance. Here, we transfer 9-atom-wide armchair-edged GNRs (9-AGNRs) grown on Au(111)/mica substrates to pre-patterned platinum electrodes, yielding polymer-free 9-AGNR field-effect transistor devices. Our devices have a resistance in the range of $10^6$ to $10^8$ $\Omega$ in the low-bias regime, which is 2 to 4 orders of magnitude lower than previous reports. Density functional theory (DFT) calculations combined with the non-equilibrium Green's function method (NEGF) explain the observed p-type electrical characteristics and further demonstrate that platinum gives strong coupling and higher transmission in comparison to other materials such as graphene.

arXiv comment6 pages, 5 figures

References in corpus (14)

• Energy Gaps in Graphene Nanoribbons
• On-surface synthesis of graphene nanoribbons with zigzag edge topology
• Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
• Exceptional ballistic transport in epitaxial graphene nanoribbons
• Engineering of robust topological quantum phases in graphene nanoribbons
• Short-Channel Field Effect Transistors with 9-Atom and 13-Atom wide Graphene Nanoribbons
• Topological Phases in Graphene Nanoribbons: Junction States, Spin Centers and Quantum Spin Chains
• Giant magnetoresistance in ultra-small Graphene based devices
• Bottom-up Graphene Nanoribbon Field-Effect Transistors
• Superlattice Structures of Graphene based Nanoribbons
• Substrate transfer and ex situ characterization of on-surface synthesized graphene nanoribbons
• Structure-dependent electrical properties of graphene nanoribbon devices with graphene electrodes
• Nanogaps with very large aspect ratios for electrical measurements
• Growth optimization and device integration of narrow-bandgap graphene nanoribbons