Engineering Efficient p-Type TMD/Metal Contacts Using Fluorographene as a Buffer Layer

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Tiziana Musso
  • Priyank V. Kumar
  • Jeffrey C. Grossman
  • Adam Foster

Research units

  • Kanazawa University
  • Swiss Federal Institute of Technology Zurich
  • Massachusetts Institute of Technology

Abstract

P-type transistors based on high work function transition metal dichalcogenide (TMD) monolayers such as MoS2 are to date difficult to produce, owing to the strong Fermi level pinning at the semiconductor/contact metal interfaces. In this work, the potential of halogenated graphenes is demonstrated as a new class of efficient hole injection layers to TMDs such as MoS2 and WSe2 by taking fluorographene (or GF) as a model buffer layer. Using first-principles computations, two commonly obtained GF stoichiometries, C2F and CF, have been studied as buffer layers between MoS2 and Pt. In particular, for high work function TMDs such as MoS2, it has been shown that C2F forms an ohmic contact, while CF leads to a significant p-SBH value. On the other hand, for low work function TMDs such as WSe2, both C2F and CF lead to p-type ohmic contacts. This analysis shows that the ability of these buffer layers to form p-type contacts depends crucially on the charge redistribution at the GF/metal interface, which is dictated by their chemical interaction and equilibrium geometry. The fundamental electronic structures between the different semiconductor/insulator/metal interfaces which are part of this study have also been investigated.

Details

Original languageEnglish
Article number1600318
Number of pages7
JournalAdvanced Electronic Materials
Volume3
Issue number6
Publication statusPublished - Jun 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • TRANSITION-METAL DICHALCOGENIDES, AUGMENTED-WAVE METHOD, MOS2 TRANSISTORS, AB-INITIO, GRAPHENE OXIDE, MONOLAYER MOS2, RESISTANCE, DENSITY, MOBILITY, DEVICES

ID: 16986135