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  • 1.
    Shetty, Naveen
    et al.
    Chalmers University of Technology, Sweden.
    He, Hans
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Mitra, Richa
    Chalmers University of Technology, Sweden.
    Huhtasaari, Johanna
    Chalmers University of Technology, Sweden.
    Iordanidou, Konstantina
    Chalmers University of Technology, Sweden.
    Wiktor, Julia
    Chalmers University of Technology, Sweden.
    Kubatkin, Sergey
    Chalmers University of Technology, Sweden.
    Dash, Saroj
    Chalmers University of Technology, Sweden.
    Yakimova, Rositsa
    Linköping University, Sweden.
    Zeng, Lunjie
    Chalmers University of Technology, Sweden.
    Olsson, Eva
    Chalmers University of Technology, Sweden.
    Lara-Avila, Samuel
    Chalmers University of Technology, Sweden; NPL National Physical Laboratory, UK.
    Scalable Fabrication of Edge Contacts to 2D Materials: Implications for Quantum Resistance Metrology and 2D Electronics2023In: ACS Applied Nano Materials, E-ISSN 2574-0970, Vol. 6, no 7, p. 6292-Article in journal (Refereed)
    Abstract [en]

    We report a reliable and scalable fabrication method for producing electrical contacts to two-dimensional (2D) materials based on the tri-layer resist system. We demonstrate the applicability of this method in devices fabricated on epitaxial graphene on silicon carbide (epigraphene) used as a scalable 2D material platform. For epigraphene, data on nearly 70 contacts result in median values of the one-dimensional (1D) specific contact resistances ρc ∼ 67 Ω·μm and follow the Landauer quantum limit ρc ∼ n-1/2, consistently reaching values ρc < 50 Ω·μm at high carrier densityn. As a proof of concept, we apply the same fabrication method to the transition metal dichalcogenide (TMDC) molybdenum disulfide (MoS2). Our edge contacts enable MoS2 field-effect transistor (FET) behavior with an ON/OFF ratio of >106 at room temperature (>109 at cryogenic temperatures). The fabrication route demonstrated here allows for contact metallization using thermal evaporation and also by sputtering, giving an additional flexibility when designing electrical interfaces, which is key in practical devices and when exploring the electrical properties of emerging materials. © 2023 The Authors. 

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