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Effect of interlayer interactions on exciton luminescence in atomic-layered MoS2 crystals

Title
Effect of interlayer interactions on exciton luminescence in atomic-layered MoS2 crystals
Authors
Kim, JG[Kim, Jung Gon]Yun, WS[Yun, Won Seok]Jo, S[Jo, Sunghwan]Lee, J[Lee, JaeDong]Cho, CH[Cho, Chang-Hee]
DGIST Authors
Kim, JG[Kim, Jung Gon]; Yun, WS[Yun, Won Seok]; Jo, S[Jo, Sunghwan]; Lee, J[Lee, JaeDong]; Cho, CH[Cho, Chang-Hee]
Issue Date
2016-07-15
Citation
Scientific Reports, 6
Type
Article
Article Type
Article
Keywords
BehaviorDensity Functional TheoryElectric FieldModelPhotoluminescenceQuantum Yield
ISSN
2045-2322
Abstract
The atomic-layered semiconducting materials of transition metal dichalcogenides are considered effective light sources with both potential applications in thin and flexible optoelectronics and novel functionalities. In spite of the great interest in optoelectronic properties of two-dimensional transition metal dichalcogenides, the excitonic properties still need to be addressed, specifically in terms of the interlayer interactions. Here, we report the distinct behavior of the A and B excitons in the presence of interlayer interactions of layered MoS 2 crystals. Micro-photoluminescence spectroscopic studies reveal that on the interlayer interactions in double layer MoS 2 crystals, the emission quantum yield of the A exciton is drastically changed, whereas that of the B exciton remains nearly constant for both single and double layer MoS 2 crystals. First-principles density functional theory calculations confirm that a significant charge redistribution occurs in the double layer MoS 2 due to the interlayer interactions producing a local electric field at the interfacial region. Analogous to the quantum-confined Stark effect, we suggest that the distinct behavior of the A and B excitons can be explained by a simplified band-bending model.
URI
http://hdl.handle.net/20.500.11750/2237
DOI
10.1038/srep29813
Publisher
Nature Publishing Group
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceLight and Matter Theory Laboratory1. Journal Articles


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