Electronic Structure and Luminescence of Quasi-Freestanding MoS2 Nanopatches on Au(111)

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• 作者：Nils Krane ; Christian Lotze ; Julia M. Läger ; Gaël Reecht ; Katharina J. Franke
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：5163-5168
• 全文大小：412K
• 年卷期：0
• ISSN：1530-6992

文摘

Monolayers of transition metal dichalcogenides are interesting materials for optoelectronic devices due to their direct electronic band gaps in the visible spectral range. Here, we grow single layers of MoS₂ on Au(111) and find that nanometer-sized patches exhibit an electronic structure similar to their freestanding analogue. We ascribe the electronic decoupling from the Au substrate to the incorporation of vacancy islands underneath the intact MoS₂ layer. Excitation of the patches by electrons from the tip of a scanning tunneling microscope leads to luminescence of the MoS₂ junction and reflects the one-electron band structure of the quasi-freestanding layer.