Li Intercalation in MoS2: In Situ Observation of Its Dynamics and Tuning Optical and Electrical Properties

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• 作者：Feng Xiong ; Haotian Wang ; Xiaoge Liu ; Jie Sun ; Mark Brongersma ; Eric Pop ; Yi Cui
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6777-6784
• 全文大小：474K
• ISSN：1530-6992

文摘

Two-dimensional layered materials like MoS₂ have shown promise for nanoelectronics and energy storage, both as monolayers and as bulk van der Waals crystals with tunable properties. Here we present a platform to tune the physical and chemical properties of nanoscale MoS₂ by electrochemically inserting a foreign species (Li⁺ ions) into their interlayer spacing. We discover substantial enhancement of light transmission (up to 90% in 4 nm thick lithiated MoS₂) and electrical conductivity (more than 200脳) in ultrathin (鈭?鈥?0 nm) MoS₂ nanosheets after Li intercalation due to changes in band structure that reduce absorption upon intercalation and the injection of large amounts of free carriers. We also capture the first in situ optical observations of Li intercalation in MoS₂ nanosheets, shedding light on the dynamics of the intercalation process and the associated spatial inhomogeneity and cycling-induced structural defects.