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Ultrafast Transient Terahertz Conductivity of Monolayer MoS2 and WSe2 Grown by Chemical Vapor Deposition

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journal contribution
posted on 17.12.2015, 06:02 by Callum J. Docherty, Patrick Parkinson, Hannah J. Joyce, Ming-Hui Chiu, Chang-Hsiao Chen, Ming-Yang Lee, Lain-Jong Li, Laura M. Herz, Michael B. Johnston
We have measured ultrafast charge carrier dynamics in monolayers and trilayers of the transition metal dichalcogenides MoS2 and WSe2 using a combination of time-resolved photoluminescence and terahertz spectroscopy. We recorded a photoconductivity and photoluminescence response time of just 350 fs from CVD-grown monolayer MoS2, and 1 ps from trilayer MoS2 and monolayer WSe2. Our results indicate the potential of these materials as high-speed optoelectronic materials.