Voltage switches exciton transport in 2D hybrid material
Researchers demonstrate electrical control over exciton transport and valley polarisation in a perovskite-WS₂ heterostructure The post Voltage switches exciton transport in 2D hybrid material appeared first on Physics World .
Researchers have discovered a method to control exciton transport in a 2D hybrid material using voltage, a significant step toward the development of valleytronic devices. Excitons are intermediate states between light and electrical charge carriers, typically recombining quickly and limiting their travel distance. By separating electrons and holes across two different layers, interlayer excitons can transport energy over longer distances.
Previous studies required precise alignment of transition-metal dichalcogenides layers, but a new hybrid perovskite-WS₂ heterostructure eliminates the need for such careful engineering. The researchers demonstrate a device where an applied voltage switches between interlayer excitons and intralayer excitons, allowing the control of whether excitons can move through the material or remain localized.
This voltage-switchable band alignment in 2D-perovskite/WS₂ heterostructures enables tunable exciton transport and valley polarization, bringing excitonic and valleytronic circuits a step closer to reality.
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