Transforming bilayer MoS2 into single-layer with strong photoluminescence using UV-ozone oxidation

The use of single-layer MoS2 in light emitting devices requires innovative methods to enhance its low photoluminescence （PL） quantum yield. In this work, we report that single-layer MoS2 with a strong PL can be prepared by oxidizing bilayer MoS2 using W-ozone oxidation. We show that as compared to m...

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Bibliographic Details
Published in:Nano research 2015-12, Vol.8 (12), p.3878-3886
Main Authors: Su, Weitao, Kumar, Naresh, Spencer, Steve J., Dai, Ning, Roy, Debdulal
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Excitons
Luminescence
Materials Science
Molybdenum disulfide
MoS2
Nanotechnology
Oxidation
Ozone
Photoluminescence
Photons
Research Article
Trions
二硫化钼
低温光致发光
单层
改造
紫外
臭氧氧化
荧光
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Summary:The use of single-layer MoS2 in light emitting devices requires innovative methods to enhance its low photoluminescence （PL） quantum yield. In this work, we report that single-layer MoS2 with a strong PL can be prepared by oxidizing bilayer MoS2 using W-ozone oxidation. We show that as compared to mechanically-exfoliated single-layer MoS2, the PL intensity of the single-layer MoS2 prepared by W-ozone oxidation is enhanced by 20-30 times. We demonstrate that the PL intensity of both neutral excitons and trions （charged excitons） can be greatly enhanced in the oxidized MoS2 samples. These results provide novel insights into the PL enhancement of single-layer MoS2.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-015-0887-7