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Ionic liquid gating offers benefits for flexible devices but causes Coulomb scattering. Our model shows bulk ionic liquid disorder often limits carrier mobility more than expected.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ionic liquid gating is advantageous for flexible and transparent electronics, enabling high carrier densities.
  • However, charged ions in ionic liquid gating induce Coulomb scattering, limiting carrier mobility in electronic channels.
  • Understanding and mitigating this scattering is crucial for optimizing device performance.

Purpose of the Study:

  • To develop a theoretical model for Coulomb scattering in ionic liquid gated systems.
  • To experimentally validate the model using graphene devices gated with ionic liquids and hexagonal boron nitride.
  • To identify the dominant sources of scattering in these systems.

Main Methods:

  • Development of a theoretical model to describe Coulomb scattering induced by ionic liquids.
  • Experimental fabrication of graphene devices with varying hexagonal boron nitride (hBN) dielectric thicknesses.
  • Ionic liquid gating measurements to probe carrier mobility and scattering mechanisms.

Main Results:

  • The developed model accurately describes Coulomb scattering in ionic liquid gated systems.
  • Experimental validation confirmed the model's predictions across different hBN thicknesses.
  • Results indicate that disorder within the bulk ionic liquid is a primary contributor to scattering, often exceeding contributions from the interface or channel.

Conclusions:

  • The theoretical model provides a framework for understanding Coulomb scattering in ionic liquid gating.
  • Ionic liquid bulk disorder is a significant factor limiting carrier mobility, necessitating careful selection and preparation of ionic liquids.
  • This work offers insights for designing improved ionic liquid gated devices with enhanced performance.