2D Materials and Applications

Two-dimensional materials are crystalline solids reduced to a single or few atomic layers, where quantum confinement and broken symmetry produce electronic and optical properties that bulk crystals simply do not exhibit. Semiconducting transition metal dichalcogenides such as monolayer MoS₂, along with elemental analogues like black phosphorus, have drawn particular attention because they host tightly bound electron-hole pairs called excitons that dominate their optical response and can be detected through photoluminescence even at room temperature. Stacking different monolayers into van der Waals heterostructures — held together by weak interlayer forces rather than chemical bonds — allows researchers to engineer band alignments and interlayer coupling with atomic precision, opening pathways toward ultrathin transistors, photodetectors, and light emitters. Central open questions include how to control defect densities that limit carrier mobility, how interlayer charge transfer dynamics can be tuned for efficient energy conversion, and whether these materials can be integrated into scalable device fabrication without sacrificing their exceptional intrinsic properties.

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Keywords

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