We report up to ten-fold enhancement of the photoresponsivity of monolayer molybdenum disulfide (MoS2) by treatment with O2:Ar (1:3) plasma. We characterize the surface of plasma-exposed MoS2 by TEM, Raman, and PL mapping and discuss the role of MoOx in improving the photocurrent generation in our devices. At the highest tested laser power of 0.1 mW, we find ten-fold enhancements to both the output current and carrier field-effect mobility at the illumination wavelength of 488 nm. We suggest that the improvement of electrical performance is due to the surface presence of MoOx resulting from the chemical conversion of MoS2 by the oxygen-containing plasma. Our results highlight the beneficial role of plasma treatment as a fast and convenient way of improving the properties of synthetic 2D MoS2 devices for future consideration in optoelectronics research.
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4 March 2019
Research Article|
March 04 2019
Photoresponsivity enhancement in monolayer MoS2 by rapid O2:Ar plasma treatment
Special Collection:
2D Transistors
Jakub Jadwiszczak
;
Jakub Jadwiszczak
1
School of Physics, Trinity College Dublin
, Dublin 2, Ireland
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
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Gen Li;
Gen Li
1
School of Physics, Trinity College Dublin
, Dublin 2, Ireland
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
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Conor P. Cullen;
Conor P. Cullen
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
3
School of Chemistry, Trinity College Dublin
, Dublin 2, Ireland
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Jing Jing Wang;
Jing Jing Wang
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
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Pierce Maguire;
Pierce Maguire
1
School of Physics, Trinity College Dublin
, Dublin 2, Ireland
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
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Georg S. Duesberg;
Georg S. Duesberg
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
3
School of Chemistry, Trinity College Dublin
, Dublin 2, Ireland
4
Institute of Physics, EIT 2, Faculty of Electrical Engineering and Information Technology, Universität der Bundeswehr München
, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
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James G. Lunney;
James G. Lunney
1
School of Physics, Trinity College Dublin
, Dublin 2, Ireland
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Hongzhou Zhang
Hongzhou Zhang
a)
1
School of Physics, Trinity College Dublin
, Dublin 2, Ireland
2
Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research (AMBER) Research Centers, Trinity College Dublin
, Dublin 2, Ireland
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Appl. Phys. Lett. 114, 091103 (2019)
Article history
Received:
December 22 2018
Accepted:
February 16 2019
Citation
Jakub Jadwiszczak, Gen Li, Conor P. Cullen, Jing Jing Wang, Pierce Maguire, Georg S. Duesberg, James G. Lunney, Hongzhou Zhang; Photoresponsivity enhancement in monolayer MoS2 by rapid O2:Ar plasma treatment. Appl. Phys. Lett. 4 March 2019; 114 (9): 091103. https://doi.org/10.1063/1.5086726
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