2D Materials and Applications

Two-dimensional materials are crystalline solids reduced to a single or few atomic layers, where quantum confinement and surface dominance fundamentally alter the electronic and optical properties that bulk forms of the same material display. Semiconducting transition metal dichalcogenides such as monolayer MoS₂, along with elemental analogs like black phosphorus, exhibit direct band gaps, unusually strong excitonic effects, and photoluminescence responses that make them promising platforms for atomically thin transistors, photodetectors, and light emitters. Stacking different 2D layers into van der Waals heterostructures — held together by weak interlayer forces rather than chemical bonds — allows researchers to engineer band alignments and interface properties with a precision that conventional epitaxial growth rarely permits. Active questions include how to control defect densities and grain boundaries that currently limit device performance, and how interlayer coupling in heterostructures can be exploited to generate novel quantum phenomena such as moiré-confined excitons.

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Keywords

Two-Dimensional MaterialsVan der Waals HeterostructuresSemiconducting Transition Metal DichalcogenidesMonolayer MoS2Black PhosphorusExcitonic Effects