Ultimate charge transport regimes in doping-controlled graphene laminates: phonon-assisted processes revealed by the linear magnetoresistance

Mohsen Moazzami Gudarzi, Sergey Slizovskiy, Boyang Mao, Endre Tovari, Gergo Pinter, David Sanderson, Maryana Asaad, Ying Xiang, Zhiyuan Wang, Jianqiang Guo, Ben Spencer, Alexandra Geim, Vladimir Fal'ko, Andrey Kretinin (Corresponding)

Research output: Contribution to journalArticlepeer-review

Abstract

Understanding and controlling the electrical properties of solution-processed 2D
materials is key to further printed electronics progress. Here we demonstrate that the thermolysis of the aromatic intercalants utilized in nanosheet exfoliation for graphene laminates opens the route to achieving high intrinsic mobility and simultaneously controlling doping type (n- and p-) and concentration over a wide range. We establish that the intra-flake mobility is high by observing a linear magnetoresistance of such solution-processed graphene laminates and using it to devolve the inter-flake tunneling and intra-layer magnetotransport. Consequently, we determine the temperature dependencies of the inter- and intra-layer characteristics. The intra-flake transport appears to be dominated by electron-phonon scattering processes at temperatures 𝑇 > 20 Kelvin, while the inter-flake transport is governed by phonon-assisted tunneling. In particular, we identify the efficiency of phonon-assisted tunneling as the main limiting factor for electrical conductivity in graphene laminates at room temperature. We also demonstrate a thermoelectric sensitivity of around 50 μV·K–1 in a solution-processed metal-free graphene-based thermocouple.
Original languageEnglish
Pages (from-to)22172 - 22180
Number of pages9
JournalACS Nano
Volume18
Issue number33
Early online date8 Aug 2024
DOIs
Publication statusPublished - 20 Aug 2024

Keywords

  • solution-processed 2D materials
  • graphene laminates
  • linear magnetoresistance
  • phonon-assisted tunneling
  • electron−phonon scattering
  • graphene thermocouples

Research Beacons, Institutes and Platforms

  • National Graphene Institute

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