Ferroelectric Domain Patterning Controlled Schottky Junction State in Monolayer MoS$_2$

TL;DR

This paper demonstrates how scanning probe controlled ferroelectric domain patterning can nonvolatily modulate the electronic states of monolayer MoS$_2$, enabling programmable Schottky junctions with potential applications in van der Waals heterostructures.

Contribution

It introduces a novel method of domain patterning to control Schottky junction states in monolayer MoS$_2$, revealing tunable barrier heights and insights into conduction mechanisms.

Findings

Schottky barrier height varies from 0.38 eV to 0.57 eV.

The modulation is tunable via a global back-gate.

Rectified I-V behavior is explained by thermionic emission.

Abstract

We exploit scanning probe controlled domain patterning in a ferroelectric top layer to induce nonvolatile modulation of the conduction characteristic of monolayer MoS$_2$ between a transistor and a junction state. In the presence of a domain wall, MoS$_2$ exhibits rectified I-V that is well described by the thermionic emission model. The induced Schottky barrier height varies from 0.38 eV to 0.57 eV and is tunabe by a SiO$_2$ global back-gate, while the tuning range of depends sensitively on the conduction band tail trapping states. Our work points to a new route to achieving programmable functionalities in van der Waals materials and sheds light on the critical performance limiting factors in these hybrid systems.