Dear Colleagues,

The fabrication and understanding of heterostructures, especially semiconductor–semiconductor junctions and metal–semiconductor heterostructures, has had a profound impact on modern society. Most electronic and renewable-energy-generating devices that we currently use are in fact based on the union of dissimilar materials, which can give rise to emergent effects that are not simply the sum of the individual effects. Two-dimensional (2D) materials, such as van der Waals materials, layered perovskites or metal-organic frameworks, are characterized by outstanding optical, electrical, and mechanical properties. Thanks to their extreme aspect ratio, these materials are especially suited to the fabrication of heterostructures, and in recent years novel electronic and optoelectronic devices with exceptional performances have been reported. Apart from 2D–2D heterostructures, a second class of heterostructures has arisen, namely mixed-dimensional heterostructures based on the combination of 2D materials with 3D, 1D or 0D ones.

This Special Issue aims to collect original research articles and reviews about heterojunctions based on 2D materials, from both fundamental and application-oriented perspectives. We solicit papers dealing with the fabrication and properties of 2D material heterojunctions, or with their use in electronic or optoelectronic devices and sensors.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

• Van der Waals materials: graphene, black phosphorus, transition metal chalcogenides, III-VI group, MXenes, hexagonal boron nitride, 2D oxides, carbides, and nitrides;
• 2D metal-organic frameworks, 2D perovskites;
• Planar (lateral) and vertical 2D–2D heterostructures and their fabrication;
• 2D–2D heterojunctions and mixed-dimensionality heterojunctions: 2D–1D, 2D–0D, 3D–2D;
• Van der Waals heterostructures, superlattices, Moiré patterns, interlayer phenomena, interlayer excitons;
• Advanced devices and applications;
• Photonics, optics, electronics, optoelectronics, valleytronics, twistronics, straintronics;
• Metal–semiconductor ohmic and Schottky contacts;
• Semiconductor–semiconductor heterojunctions of type I, II, and III contacts;
• Semiconductor–semiconductor type I, II, and III contacts.

We look forward to receiving your contributions.

Dr. Riccardo Frisenda
Dr. Qinghua Zhao
Guest Editors

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• van der waals materials
• 2D metal-organic frameworks and 2D perovskites
• 2D–2D heterostructures
• mixed-dimensionality heterostructures: 2D–1D, 2D–0D, 3D–2D
• heterostructure fabrication
• van der waals heterostructures, superlattices, moiré patterns
• advanced devices and applications
• photonics, optics, electronics, optoelectronics
• metal–semiconductors
• semiconductor–semiconductor heterojunctions