Transfer current in p-type graphene/MoS2 heterostructures

TL;DR

This paper presents experimental measurements and a comprehensive model of transfer characteristics in p-doped graphene/MoS2 heterostructures at room temperature, incorporating electrostatic and transport calculations that align well with observed data.

Contribution

It introduces a detailed self-consistent model combining Poisson and Boltzmann equations to analyze transfer characteristics in graphene/MoS2 heterostructures, including effects of optical pumping.

Findings

Model accurately predicts transfer characteristics

Optical pumping effects are incorporated into the analysis

Good agreement between calculations and experimental data

Abstract

Transfer characteristics of p-doped graphene/monolayer-MoS2 heterostructure at 300 K are measured experimentally and analyzed based on a model calculation. In the model, we first discretize the Poisson equation (PE) into multiple zones. In each zone the charge density is assumed constant and the PE can be transformed into a linear equation to determine the chemical potential self-consistently. To calculate the electrical conductivity, we solve the Boltzmann transport equation in the relaxation-time approximation using the inelastic acoustic phonon scattering by solving the Dirac equation. The relationship between the Dirac voltage (the voltage at which the Fermi level is located at the Dirac point) and the Fermi energy (i.e. the initial chemical potential at 0K) is derived. These calculations are performed without and with optical pumping and the results obtained agree well with the experimental data.