Conduction modulation of solution-processed two-dimensional materials

TL;DR

This paper demonstrates a method to modulate conduction in solution-processed 2D materials using the Stark effect, significantly improving device performance by inducing charge redistribution, with potential applications across various low-dimensional materials.

Contribution

It introduces a novel conduction modulation technique for solution-processed 2D materials via the Stark effect, validated on MoS2 and applicable to other similar materials.

Findings

Achieved >10^5 switching ratio in conduction modulation

Demonstrated charge redistribution causes modulation via spectroscopic analysis

Applicable to various solution-processed 2D and low-dimensional materials

Abstract

Solution-processed two-dimensional (2D) materials hold promise for their scalable applications. However, the random, fragmented nature of the solution-processed nanoflakes and the poor percolative conduction through their discrete networks limit the performance of the enabled devices. To overcome the problem, we report conduction modulation of the solution-processed 2D materials via the Stark effect. Using liquid-phase exfoliated molybdenum disulfide (MoS2) as an example, we demonstrate nonlinear conduction modulation with a switching ratio of >105 by the local fields from the interfacial ferroelectric P(VDF-TrFE). Through density-functional theory calculations and in situ Raman scattering and photoluminescence spectroscopic analysis, we understand the modulation arises from a charge redistribution in the solution-processed MoS2. Beyond MoS2, we show the modulation may be viable for the other solution-processed 2D materials and low-dimensional materials. The effective modulation can open their electronic device applications.