Kim, J-S and Maity, N and Kim, M and Fu, S and Juneja, R and Singh, A and Akinwande, D and Lin, J-F (2022) Strain-Modulated Interlayer Charge and Energy Transfers in MoS2/WS2Heterobilayer. In: ACS Applied Materials and Interfaces, 14 (41). pp. 46841-46849.
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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.
| Item Type: | Journal Article |
|---|---|
| Publication: | ACS Applied Materials and Interfaces |
| Publisher: | American Chemical Society |
| Additional Information: | The copyright for this article belongs to the Author(s). |
| Keywords: | Charge transfer; Energy transfer; Hydrostatic pressure; Layered semiconductors; Molybdenum compounds; Photoluminescence; Tungsten compounds; Van der Waals forces, Charge transfer energy; Density-functional-theory; Diamond-anvil cell; Electrical gating; Energy-transfer; Excitonic energy; Excitonic properties; Heterobilayer; Strain engineering; Van der Waal, Density functional theory |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 04 Nov 2022 06:55 |
| Last Modified: | 04 Nov 2022 06:55 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77661 |
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