Tuning Interlayer Coupling in Large-Area Heterostructures with CVD-Grown MoS2 and WS2 Monolayers
| Autor: | Kai Liu, Jun Kang, Joonki Suh, Deepa S. Narang, Joonsuk Park, Jie Ji, Sefaattin Tongay, Robert Sinclair, Jingbo Li, Unsal Koldemir, Wen Fan, Junqiao Wu |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Bioengineering Charge (physics) Nanotechnology Heterojunction General Chemistry Condensed Matter Physics Coupling (electronics) Condensed Matter::Materials Science Transition metal Monolayer Optoelectronics General Materials Science Charge carrier business Luminescence Layer (electronics) |
| Zdroj: | Nano Letters. 14:3185-3190 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/nl500515q |
| Popis: | Band offsets between different monolayer transition metal dichalcogenides are expected to efficiently separate charge carriers or rectify charge flow, offering a mechanism for designing atomically thin devices and probing exotic two-dimensional physics. However, developing such large-area heterostructures has been hampered by challenges in synthesis of monolayers and effectively coupling neighboring layers. Here, we demonstrate large-area (>tens of micrometers) heterostructures of CVD-grown WS2 and MoS2 monolayers, where the interlayer interaction is externally tuned from noncoupling to strong coupling. Following this trend, the luminescence spectrum of the heterostructures evolves from an additive line profile where each layer contributes independently to a new profile that is dictated by charge transfer and band normalization between the WS2 and MoS2 layers. These results and findings open up venues to creating new material systems with rich functionalities and novel physical effects. |
| Databáze: | OpenAIRE |
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