Interlayer charge transfer in supported and suspended MoS2/Graphene/MoS2 vertical heterostructures

In this letter, we report on the optical and structural properties of supported and suspended MoS2/Graphene/MoS2 vertical heterostructures using Raman and photoluminescence (PL) spectroscopies. Vertical heterostructures (VH) are formed by multiple wet transfers on micro-sized holes in SiO2/Si substr...

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Bibliographic Details
Published in:PloS one 2023-07, Vol.18 (7), p.e0283834-e0283834
Main Authors: Rocha Robledo, Ana K, Flores Salazar, Mario, Muñiz Martínez, Bárbara A, Torres-Rosales, Ángel A, Lara-Alfaro, Héctor F, Del Pozo-Zamudio, Osvaldo, Cerda-Méndez, Edgar A, Jiménez-Sandoval, Sergio, De Luna Bugallo, Andres
Format: Article
Language:English
Subjects:
Cellulose acetate
Charge transfer
Chemical vapor deposition
Engineering and Technology
Graphene
Heterostructures
Interlayers
Lasers
Molecular beam epitaxy
Molybdenum
Molybdenum disulfide
Optical properties
Organic chemicals
Photoluminescence
Photons
Physical Sciences
Raman spectroscopy
Research and Analysis Methods
Silicon dioxide
Silicon substrates
Spectroscopy
Spectrum analysis
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Summary:In this letter, we report on the optical and structural properties of supported and suspended MoS2/Graphene/MoS2 vertical heterostructures using Raman and photoluminescence (PL) spectroscopies. Vertical heterostructures (VH) are formed by multiple wet transfers on micro-sized holes in SiO2/Si substrates, resulting in VH with different configurations. The strong interlayer coupling is confirmed by Raman spectroscopy. Additionally, we observe an enhancement of the PL emission in the three-layer VH (either support or suspended) compared with bare MoS2 or MoS2/Graphene. This suggests the formation of a spatial type-II band alignment assisted by the graphene layer and thus, the operation of the VH as a n++/metal/n junction.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0283834