Two-dimensional Janus van der Waals heterojunctions: a review of recent research progresses

TL;DR

This review summarizes recent advances in two-dimensional Janus van der Waals heterojunctions, highlighting their unique properties and potential applications in electronics and energy conversion, while discussing future research challenges.

Contribution

It provides a comprehensive overview of the fundamental properties, applications, and future directions of 2D Janus vdW heterostructures, consolidating recent research progress.

Findings

Exhibit tunable electronic structures and wide light absorption spectra.

Show controllable contact resistance and intrinsic polarization effects.

Potential for applications in electronics and energy conversion devices.

Abstract

Two-dimensional Janus van der Waals (vdW) heterojunctions, referring to the junction containing at least one Janus material, are found to exhibit tuneable electronic structures, wide light adsorption spectra, controllable contact resistance, and sufficient redox potential due to the intrinsic polarization and unique interlayer coupling. These novel structures and properties are promising for the potential applications in electronics and energy conversion devices. To provide a comprehensive picture about the research progress and guide the following investigations, here we summarize their fundamental properties of different types of two-dimensional Janus vdW heterostructures including electronic structure, interface contact and optical properties, and discuss the potential applications in electronics and energy conversion devices. The further challenges and possible research directions of the novel heterojunctions are discussed at the end of this review.