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

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• 作者：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
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：November 25, 2014
• 年：2014
• 卷：8
• 期：11
• 页码：11147-11153
• 全文大小：540K
• ISSN：1936-086X

文摘

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.

Keywords:

transition metal dichalcogenide; CVD; molybdenum disulfide; tungsten diselenide; ultrafast; terahertz conductivity; photoluminescence