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A real-time Raman spectroscopy study of the dynamics of laser-thinning of MoS2 flakes to monolayers
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. State Key Laboratory of ASIC & System, School of Information Science and Technology, Fudan University, Shanghai 200433, China.
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2017 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 7, no 12, article id 125329Article in journal (Refereed) Published
Abstract [en]

Transition metal dichalcogenides (TMDCs) in monolayer form have attracted a great deal of attention for electronic and optical applications. Compared to mechanical exfoliation and chemical synthesis, laser thinning is a novel and unique “on-demand” approach to fabricate monolayers or pattern desired shapes with high controllability and reproducibility. Its successful demonstration motivates a further exploration of the dynamic behaviour of this local thinning process. Here, we present an in-situ study of void formation by laser irradiation with the assistance of temporal Raman evolution. In the analysis of time-dependent Raman intensity, an empirical formula relating void size to laser power and exposure time is established. Void in thinner MoS2 flakes grows faster than in thicker ones as a result of reduced sublimation temperature in the two-dimensional (2D) materials. Our study provides useful insights into the laser-thinning dynamics of 2D TMDCs and guidelines for an effective control over the void formation.

Place, publisher, year, edition, pages
2017. Vol. 7, no 12, article id 125329
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-338543DOI: 10.1063/1.5008441ISI: 000418950100019OAI: oai:DiVA.org:uu-338543DiVA, id: diva2:1172443
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-04-11Bibliographically approved

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