Lithium-ion-based solid electrolyte tuning of the carrier density in graphene

TL;DR

This paper introduces a lithium-ion-based solid electrolyte that effectively tunes the carrier density in graphene, achieving larger modulation than oxide dielectrics and operational at lower temperatures than liquid electrolytes.

Contribution

The authors present a novel solid electrolyte method for carrier density tuning in graphene, combining high modulation capacity with low-temperature operation.

Findings

Carrier density change up to 1*10^14/cm^2 achieved

Effective at temperatures as low as 150 K

Comparable modulation to liquid electrolytes

Abstract

We have developed a technique to tune the carrier density in graphene using a lithium-ion-based solid electrolyte. We demonstrate that the solid electrolyte can be used as both a substrate to support graphene and a back gate.It can induce a change in the carrier density as large as 1*10^14/cm^2, which is much larger than that induced with oxide-film dielectrics, and it is comparable with that induced by liquid electrolytes. Gate modulation of the carrier density is still visible at 150 K, which is lower than the glass transition temperature of most liquid gating electrolytes.