Grain boundaries (GBs) frequently emerge in a CVD-grown large-scale transition metal dichalcogenides monolayer thin film, which affect the electronic and optical properties of the material. Photoluminescence (PL) can be easily quenched/enhanced at GBs, which are, however, merely investigated in relatively large tilt angles () in previous research. Here, we experimentally examine the PL properties of monolayer WS2 GBs with tilt angles as small as a few degrees. Contrary to conventional wisdom, we find that PL intensity remains intact by the GBs when their tilt angles . The abnormal PL behavior is elucidated by a detailed structure analysis on the dislocation cores. For a small tilt angle, the strain fields introduced by the defective cores are sparsely distributed without mutual coupling, and the chemical stoichiometry along the GBs preserves very well. These two key structural features of the small-tilt-angle GBs allow excitons to diffuse transparently across the GB, leading to a neglectable influence on the optical and electronic properties, as verified by our first-principle simulations. The PL invariant of the small-tilt-angle GBs sheds light on the future development of CVD-grown wafer-scale techniques and their optical applications.
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1 August 2022
Research Article|
August 02 2022
Deciphering the structure-photoluminescence correlation at small-tilt-angle grain boundaries in monolayer WS2
Fuchen Hou;
Fuchen Hou
(Data curation, Project administration, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
2
Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology
, Shenzhen 518055, China
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Yubo Zhang;
Yubo Zhang
(Data curation, Funding acquisition, Project administration, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
3
MinJiang Collaborative Center for Theoretical Physics, College of Physics and Electronic Information Engineering, Minjiang University
, Fuzhou 350108, China
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Daiyue Li;
Daiyue Li
(Data curation, Methodology, Project administration, Writing – original draft)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
2
Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology
, Shenzhen 518055, China
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Liangyu Che;
Liangyu Che
(Data curation)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
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Junhao Lin
Junhao Lin
a)
(Data curation, Funding acquisition, Project administration, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
2
Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology
, Shenzhen 518055, China
a)Author to whom correspondence should be addressed: [email protected]
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Fuchen Hou
1,2
Yubo Zhang
1,3
Daiyue Li
1,2
Liangyu Che
1
Junhao Lin
1,2,a)
1
Department of Physics and Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology
, Shenzhen 518055, China
2
Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology
, Shenzhen 518055, China
3
MinJiang Collaborative Center for Theoretical Physics, College of Physics and Electronic Information Engineering, Minjiang University
, Fuzhou 350108, China
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 121, 051104 (2022)
Article history
Received:
April 30 2022
Accepted:
July 16 2022
Citation
Fuchen Hou, Yubo Zhang, Daiyue Li, Liangyu Che, Junhao Lin; Deciphering the structure-photoluminescence correlation at small-tilt-angle grain boundaries in monolayer WS2. Appl. Phys. Lett. 1 August 2022; 121 (5): 051104. https://doi.org/10.1063/5.0097638
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