First-principles study of two-dimensional van der Waals heterojunctions

TL;DR

This paper reviews recent first-principles theoretical studies on the structural, electronic, electrical, and optical properties of 2D van der Waals heterojunctions, highlighting their potential for advanced electronic and optoelectronic applications.

Contribution

It provides a comprehensive overview of density functional theory studies on various 2D heterojunctions, emphasizing their promising applications beyond single-layer materials.

Findings

Heterojunctions exhibit unique electronic properties.

Potential for use in electronic and photovoltaic devices.

Theoretical results guide experimental development.

Abstract

Research on graphene and other two-dimensional (2D) materials, such as silicene, germanene, phosphorene, hexagonal boron nitride (h-BN), graphitic carbon nitride (g-C3N4), graphitic zinc oxide (g-ZnO) and molybdenum disulphide (MoS2), has recently received considerable interest owing to their outstanding properties and wide applications. Looking beyond this field, combining the electronic structures of 2D materials in ultrathin van der Waals heterojunctions has also emerged to widely study theoretically and experimentally to explore some new properties and potential applications beyond their single components. Here, this article reviews our recent theoretical studies on the structural, electronic, electrical and optical properties of 2D van der Waals heterojunctions using density functional theory calculations, including the Graphene/Silicene, Graphene/Phosphorene, Graphene/g-ZnO, Graphene/MoS2 and g-C3N4/MoS2 heterojunctions. Our theoretical simulations, designs and calculations show that novel 2D van der Waals heterojunctions provide a promising future for electronic, electrochemical, photovoltaic, photoresponsive and memory devices in the experiments.