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Home > Press > Comprehensive review of heterogeneously integrated 2D materials

Schematic illustration of the newly emerged 2D heterostructures research with various heterogeneous integration of 2D materials.

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Schematic illustration of the newly emerged 2D heterostructures research with various heterogeneous integration of 2D materials. CREDIT Author

Abstract:
In a paper published in NANO, a group of researchers from Sungkyunkwan University, South Korea provide a comprehensive review of heterogeneously integrated two dimensional (2D) materials from an extensive library of atomic 2D materials with selectable material properties to open up fascinating possibilities for the design of functional novel devices.

Comprehensive review of heterogeneously integrated 2D materials

Singapore | Posted on March 6th, 2020

Since the discovery of Graphene by Andre Geim and Konstantin Novoselov, 2D materials, e.g., graphene, black phosphorous (BP), transition metal dichalcogenides (TMDCs), and hexagonal boron nitride (h-BN) have attracted extensive attention due to their broad physical properties and wide range of applications to electronic and optoelectronic devices. Research on these 2D materials has matured to the point where an extensive library of atomically thin 2D materials with selectable material properties has been created and continues to grow.

By combining or stacking these 2D materials, it is possible to construct 2D heterostructures, which are built by directly stacking individual monolayers comprising different materials. Each monolayer within a 2D heterostructure is highly stable, due to strong covalent bonds between the atoms within that monolayer. However, the forces between the monolayers that keep said monolayers stacked one above the other to form the 2D heterostructure happen to be relatively weak van der Waals interactions. Due to this, each of the monolayers retains its intrinsic properties. Moreover, unlike in conventional semiconductor heterostructures where component material selection is restricted to those with similar lattice structures, the lattice mismatch requirements of stacked heterostructures can be relaxed due to the weakness of the van der Waal's forces. This means that one can combine insulating, semiconducting, or metallic 2D materials to form a single 2D heterostructure despite their different lattice structures.

When a monolayer is stacked in combination with other monolayers made out of different materials, a variety of new heterostructures with atomically thin 2D heterojunctions can be created. Heterostructures made from a particular combination of materials will have a certain set of physical characteristics depending on which materials they are made from. The unusual physical characteristics of 2D heterostructures make them suitable for use in a wide range of applications.

In this review, various 2D heterostructures are discussed along with an explanation of novel electronic and optoelectronic properties, advanced synthesis technical developments, as well as new functional applications available. It provides an understanding of the current research trends in 2D materials, so as to explore future possibilities for nanomaterial research.

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This research was supported by the National Research Foundation of Korea funded by the Korean government (grant nos. 2013M3A6B1078873, 2015R1D1A1A09057297, 2017R1A4A1015400, and 2017R1A2A2A05001403).

Corresponding authors for this study are Euyheon Hwang ( and Sungjoo Lee ) from SKKU Advanced Institute of Nanotechnology and Department of Nano Engineering, Sungkyunkwan University.

For more insight into the research described, readers are invited to access the paper on NANO.

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