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Updated: Jul 21, 2025
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
Published on: November 28, 2017
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Interlayer charge transfer in supported and suspended MoS2/Graphene/MoS2 vertical heterostructures
Ana K Rocha Robledo1, Mario Flores Salazar2, Bárbara A Muñiz Martínez1
1Cinvestav Unidad Querétaro, Querétaro, México.
Plos One
|July 25, 2023
Summary
We explored MoS2/Graphene/MoS2 vertical heterostructures, finding enhanced photoluminescence due to graphene
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Vertical heterostructures (VH) offer unique electronic and optical properties.
- Molybdenum disulfide (MoS2) and graphene are key 2D materials for advanced electronics.
- Understanding interlayer coupling is crucial for designing novel heterostructures.
Purpose of the Study:
- To investigate the optical and structural properties of MoS2/Graphene/MoS2 vertical heterostructures.
- To analyze the influence of graphene on the electronic band alignment and photoluminescence.
- To confirm interlayer coupling and assess the potential of these VHs as n++/metal/n junctions.
Main Methods:
- Fabrication of supported and suspended MoS2/Graphene/MoS2 VHs via multiple wet transfers.
- Characterization using Raman spectroscopy to probe structural properties and interlayer coupling.
- Photoluminescence (PL) spectroscopy to evaluate optical properties and emission enhancement.
Main Results:
- Raman spectroscopy confirmed strong interlayer coupling in the fabricated VHs.
- A significant enhancement in PL emission was observed for three-layer VHs compared to bare MoS2 or MoS2/Graphene.
- Evidence suggests the formation of a spatial type-II band alignment facilitated by the graphene layer.
Conclusions:
- The MoS2/Graphene/MoS2 VHs exhibit enhanced optical properties.
- Graphene plays a crucial role in achieving type-II band alignment.
- These VHs show promise for applications as n++/metal/n junctions.
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