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Issue 17, 2014
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Tuning the electrical property via defect engineering of single layer MoS2 by oxygen plasma

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Abstract

We have demonstrated that the electrical property of single-layer molybdenum disulfide (MoS2) can be significantly tuned from the semiconducting to the insulating regime via controlled exposure to oxygen plasma. The mobility, on-current and resistance of single-layer MoS2 devices were varied by up to four orders of magnitude by controlling the plasma exposure time. Raman spectroscopy, X-ray photoelectron spectroscopy and density functional theory studies suggest that the significant variation of electronic properties is caused by the creation of insulating MoO3-rich disordered domains in the MoS2 sheet upon oxygen plasma exposure, leading to an exponential variation of resistance and mobility as a function of plasma exposure time. The resistance variation calculated using an effective medium model is in excellent agreement with the measurements. The simple approach described here can be used for the fabrication of tunable two-dimensional nanodevices based on MoS2 and other transition metal dichalcogenides.

Graphical abstract: Tuning the electrical property via defect engineering of single layer MoS2 by oxygen plasma

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Supplementary files

Article information


Submitted
21 Apr 2014
Accepted
13 Jun 2014
First published
17 Jun 2014

Nanoscale, 2014,6, 10033-10039
Article type
Paper

Tuning the electrical property via defect engineering of single layer MoS2 by oxygen plasma

M. R. Islam, N. Kang, U. Bhanu, H. P. Paudel, M. Erementchouk, L. Tetard, M. N. Leuenberger and S. I. Khondaker, Nanoscale, 2014, 6, 10033
DOI: 10.1039/C4NR02142H

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