Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6290
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Funding
- Chinese National Key Fundamental Research Project [2013CBA01604, 2011CB922103, 2011CB707601, 2010CB923401, 2011CB302004]
- National Natural Science Foundation of China [61325020, 61261160499, 11274154, 61229401, 21173040, 21373045, 113279028, 61274114]
- National Science and Technology Major Project [2011ZX02707]
- Natural Science Foundation of Jiangsu Province [BK2012302, BK20130055, BK20130016, BK2012024]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120091110028]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Molybdenum disulfide is considered as one of the most promising two-dimensional semiconductors for electronic and optoelectronic device applications. So far, the charge transport in monolayer molybdenum disulfide is dominated by extrinsic factors such as charged impurities, structural defects and traps, leading to much lower mobility than the intrinsic limit. Here we develop a facile low-temperature thiol chemistry route to repair the sulfur vacancies and improve the interface, resulting in significant reduction of the charged impurities and traps. High mobility > 80 cm(2)V(-1)s(-1) is achieved in backgated monolayer molybdenum disulfide field-effect transistors at room temperature. Furthermore, we develop a theoretical model to quantitatively extract the key microscopic quantities that control the transistor performances, including the density of charged impurities, short-range defects and traps. Our combined experimental and theoretical study provides a clear path towards intrinsic charge transport in two-dimensional dichalcogenides for future high-performance device applications.
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