Electrical Transport Properties of Polycrystalline Monolayer Molybdenum Disulfide

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• 作者：Sina Najmaei ; Matin Amani ; Matthew L. Chin ; Zheng Liu ; A. Glen Birdwell ; Terrance P. O鈥橰egan ; Pulickel M. Ajayan ; Madan Dubey ; Jun Lou
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：8
• 期：8
• 页码：7930-7937
• 全文大小：520K
• ISSN：1936-086X

文摘

Semiconducting MoS₂ monolayers have shown many promising electrical properties, and the inevitable polycrystallinity in synthetic, large-area films renders understanding the effect of structural defects, such as grain boundaries (GBs, or line-defects in two-dimensional materials), essential. In this work, we first examine the role of GBs in the electrical-transport properties of MoS₂ monolayers with varying line-defect densities. We reveal a systematic degradation of electrical characteristics as the line-defect density increases. The two common MoS₂ GB types and their specific roles are further examined, and we find that only tilt GBs have a considerable effect on the MoS₂ electrical properties. By examining the electronic states and sources of disorder using temperature-dependent transport studies, we adopt the Anderson model for disordered systems to explain the observed transport behaviors in different temperature regimes. Our results elucidate the roles played by GBs in different scenarios and give insights into their underlying scattering mechanisms.

Keywords:

two-dimensional materials; MoS₂; polycrystallinity; grain boundaries; electronic transport