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

Su, W; Kumar, N; Spencer, S J; Dai, N*; Roy, D (2015) Transforming bilayer MoS2 into single-layer with strong photoluminescence using UV-ozone oxidation. Nano Res., 8 (12). pp. 3878-3886.

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Abstract

The application 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 a single-layer MoS2 with a strong PL can be prepared by oxidizing bilayer MoS2 using UV-ozone oxidation. We show that as compared to mechanically-exfoliated single-layer MoS2, the PL intensity of the single-layer prepared by UV-ozone oxidation is enhanced by 20-30 times. We demonstrate that PL intensity of both neutral excitons and trions (charged excitons) can be greatly enhanced on the oxidized MoS2 samples. These results provide novel insights into PL enhancement of single-layer MoS2.

Item Type: Article
Subjects: Nanoscience
Nanoscience > Surface and Nanoanalysis
Identification number/DOI: 10.1007/s12274-015-0887-7
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6971

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