Electric Transport Properties in the 2D-MoS2

TL;DR

This study investigates the electric transport properties of nanosized 2D-MoS2 flakes under uniaxial pressure, revealing non-linear current-voltage behavior, hysteresis, and charge accumulation effects at room temperature.

Contribution

It provides experimental data on the pressure-dependent electrical behavior of 2D-MoS2 and explains the phenomena through a surface charge accumulation model.

Findings

Current-voltage characteristics are non-linear and hysteretic.

Long-term decay of current and voltage observed after switching.

Surface charge accumulation causes polarization effects.

Abstract

The features of electric transport in the powder samples consisting of the nanosize 2D-MoS2 flakes with different number of layers have been studied under the conditions of uniaxial pressure. There have been measured current-voltage characteristics at the room temperature in the voltage range of 0 through 1.5 V at 3 magnitudes of the uniaxial pressure from 5 through 25 bars. The current-voltage characteristics are shown to be non-linear and to form a loop during successive increasing and decreasing voltage. The long-term decays of the current on applying voltage to the sample and of the voltage on the sample in the no-load mode on switching off have been observed. The observed results are explained by the model of the surface charge accumulation causing polarization.