Oxide-mediated recovery of field-effect mobility in plasma-treated MoS<inf>2</inf>
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2018Access:
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Jadwiszczak, J. and O'Callaghan, C. and Zhou, Y. and Fox, D.S. and Weitz, E. and Keane, D. and Cullen, C.P. and O'Reilly, I. and Downing, C. and Shmeliov, A. and Maguire, P. and Gough, J.J. and McGuinness, C. and Ferreira, M.S. and Bradley, A.L. and Boland, J.J. and Duesberg, G.S. and Nicolosi, V. and Zhang, H., Oxide-mediated recovery of field-effect mobility in plasma-treated MoS<inf>2</inf>, Science Advances, 4, 3, 2018, eaao5031-Download Item:
Abstract:
Precise tunability of electronic properties of two-dimensional (2D) nanomaterials is a key goal of current research in this field of materials science. Chemical modification of layered transition metal dichalcogenides leads to the creation of heterostructures of low-dimensional variants of these materials. In particular, the effect of oxygen-containing plasma treatment on molybdenum disulfide (MoS2) has long been thought to be detrimental to the electrical performance of the material. We show that the mobility and conductivity of MoS2 can be precisely controlled and improved by systematic exposure to oxygen/argon plasma and characterize the material using advanced spectroscopy and microscopy. Through complementary theoretical modeling, which confirms conductivity enhancement, we infer the role of a transient 2D substoichiometric phase of molybdenum trioxide (2D-MoOx) in modulating the electronic behavior of the material. Deduction of the beneficial role of MoOx will serve to open the field to new approaches with regard to the tunability of 2D semiconductors by their low-dimensional oxides in nano-modified heterostructures.
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http://people.tcd.ie/nicolovhttp://people.tcd.ie/hozhang
http://people.tcd.ie/cmcguin
http://people.tcd.ie/bradlel
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Science Advances4
3
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Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1126/sciadv.aao5031Metadata
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