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- W4301373407 abstract "Excitonic properties in 2D heterobilayers are closely governed by charge transfer (CT) and excitonic energy transfer (ET) at van der Waals interfaces. Various means have been employed to modulate the interlayer CT and ET, including electrical gating and modifying interlayer spacing, but with limited extent in their controllability. Here, we report a novel method to modulate these transfers in the MoS2/WS2 heterobilayer by applying compressive strain under hydrostatic pressure. Raman and photoluminescence measurements, combined with density functional theory calculations, show pressure-enhanced interlayer interaction of the heterobilayer. Heterobilayer-to-monolayer photoluminescence intensity ratio (η) of WS2 decreases by five times up to ≈4 GPa, suggesting enhanced ET, whereas it increases by an order of magnitude at higher pressures and reaches almost unity. Theoretical calculations show that orbital switching and charge transfers in the heterobilayer's hybridized conduction band are responsible for the non-monotonic modulation of the transfers. Our findings provide a compelling approach toward effective mechanical control of CT and ET in 2D excitonic devices." @default.
- W4301373407 created "2022-10-05" @default.
- W4301373407 creator A5014448447 @default.
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- W4301373407 date "2022-10-04" @default.
- W4301373407 modified "2023-10-14" @default.
- W4301373407 title "Strain-Modulated Interlayer Charge and Energy Transfers in MoS<sub>2</sub>/WS<sub>2</sub> Heterobilayer" @default.
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- W4301373407 doi "https://doi.org/10.1021/acsami.2c10982" @default.
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- W4301373407 hasPublicationYear "2022" @default.
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