Interlayer Coupling and Pressure Engineering in Bilayer MoS2

Controlling the interlayer coupling by tuning lattice parameters through pressure engineering is an important route for tailoring the optoelectronic properties of two-dimensional materials. In this work, we report a pressure-dependent study on the exciton transitions of bilayer MoS2 exfoliated on a...

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Bibliographic Details
Published in:Crystals (Basel) 2022-05, Vol.12 (5), p.693
Main Authors: Qiao, Wei, Sun, Hao, Fan, Xiaoyue, Jin, Meiling, Liu, Haiyang, Tang, Tianhong, Xiong, Lei, Niu, Binghui, Li, Xiang, Wang, Gang
Format: Article
Language:English
Subjects:
2D materials
Anvils
bilayer MoS2
Coupling
Diamond anvil cells
Energy
Excitons
Hydrostatic pressure
interlayer coupling
Interlayers
Lattice parameters
Low pressure
Molybdenum disulfide
Optoelectronics
Phase transitions
Photoluminescence
Pressure dependence
pressure engineering
Reflectance
Room temperature
Semiconductors
Spectra
Two dimensional materials
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Summary:Controlling the interlayer coupling by tuning lattice parameters through pressure engineering is an important route for tailoring the optoelectronic properties of two-dimensional materials. In this work, we report a pressure-dependent study on the exciton transitions of bilayer MoS2 exfoliated on a diamond anvil surface. The applied hydrostatic pressure changes from ambient pressure up to 11.05 GPa using a diamond anvil cell device. Raman, photoluminescence, and reflectivity spectra at room temperature are analyzed to characterize the interlayer coupling of this bilayer system. With the increase of pressure, the indirect exciton emission disappears completely at about 5 GPa. Importantly, we clearly observed the interlayer exciton from the reflectivity spectra, which becomes invisible at a low pressure around 1.26 GPa. This indicates that the interlayer exciton is very sensitive to the hydrostatic pressure due to the oscillator strength transfer from the direct transition to the indirect one.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12050693