In recent years, atomically thin two-dimensional (2D) materials, like graphene, transition metal dichalcogenide (TMDs) and h-BN, exhibit intriguing electrical and optical properties due to their special electronic and crystal bonding structure. 2D material is layered crystal structure with intralayer covalent bonding and van der Waals in nature bonding between layers.

Monolayer graphene possesses semi-metal and zero-gap property with very small overlap between the conduction band and valance band. Graphene with high mobility up to 250,000 cm2V-1 s-1 makes it extremely promising for nanodevice electrode material. The family of TMDs, like MoS2, WSe2, WS2 are typical semiconductor with sizeable bandgap. Many observations have confirmed that TMDs material has outstanding field effect control promising for the future nanoelectronics like transistors and logical circuits, and also demonstrated high-efficient exciton and photolumines¬cence properties as optoelectronics application. h-BN is the typical insulator material can be served as dielectric layer and protection layer for advanced nanodevices.

2D functional devices, in particular, are fully taken advantage of the difference band gap and control availability of individuals, which can provide an excellent platform to investigate the electron-hole flow, electron-hole coupling, electron-hole bonding and recombination, etc. Therefore, 2D functional devices can help us highly understand the electronic transport and light-matter interaction for the future nanoelectronics and optoelectronics.

The primary goal of this special issue is to delve into the innovative realms of these 2D materials and their pivotal role in developing functional devices. We invite contributions that explore underlying structure, fabrication, measurement, physical principles and elucidating the electrical and optical of functional devices based on 2D materials, with particular interest in 2D material synthesis, 2D material characterization, 2D device fabrication, 2D nanoelectronics, and light-mater interaction, etc. We aim to foster a multidisciplinary dialogue that bridges the gap between theoretical research and practical applications, providing a thorough understanding of how these materials can be harnessed in various functional devices.

We welcome a variety of contributions including original research articles, reviews, short communications, and perspective pieces and case studies, etc. Through this special issue, we aim to explore the devices based on 2D material to fundamentally understand their physics and chemical properties. We welcome researchers from various disciplines to provide interdisciplinary perspectives on 2D materials and functional devices. Your contributions will play a crucial role in advancing knowledge in this field.