Application of sodium-ion-based solid electrolyte in electrostatic tuning of carrier density in graphene

TL;DR

This paper demonstrates that a sodium-ion-based solid electrolyte can more effectively tune carrier density in graphene compared to lithium-ion electrolytes, opening new avenues for electrostatic gating in 2D materials.

Contribution

It introduces a novel sodium-ion solid electrolyte for electrostatic gating, showing enhanced carrier tuning in graphene over previous lithium-ion-based electrolytes.

Findings

Sodium-ion electrolyte achieves stronger carrier density modulation.

Sodium-ion electrolyte outperforms lithium-ion electrolyte in gating efficiency.

Potential for improved gating applications in 2D materials.

Abstract

Using a solid electrolyte to tune the carrier density in thin-film materials is an emerging technique that has potential applications in both basic and applied research. Until now, only materials containing small ions, such as protons and lithium ions, have been used to demonstrate the gating effect. Here, we report the study of a lab-synthesised sodium-ion-based solid electrolyte, which shows a much stronger capability to tune the carrier density in graphene than previously reported lithium-ion-based solid electrolyte. Our findings may stimulate the search for solid electrolytes better suited for gating applications, taking benefit of many existing materials developed for battery research.