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Rhenium-doped MoS2 films
Hallam, Toby; Monaghan, Scott; Gity, Farzan; Ansari, Lida; Schmidt, Michael; Downing, Clive; Cullen, Conor P.; Nicolosi, Valeria; Hurley, Paul K.; Duesberg, Georg S.
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Tailoring the electrical properties of transition metal dichalcogenides by doping is one of the biggest challenges for the application of 2D materials in future electronic devices. Here, we report on a straightforward approach to the n-type doping of molybdenum disulfide (MoS2) films with rhenium (Re). High-Resolution Scanning Transmission Electron Microscopy and Energy-Dispersive X-ray spectroscopy are used to identify Re in interstitial and lattice sites of the MoS2 structure. Hall-effect measurements confirm the electron donating influence of Re in MoS2, while the nominally undoped films exhibit a net p-type doping. Density functional theory (DFT) modelling indicates that Re on Mo sites is the origin of the n-type doping, whereas S-vacancies have a p-type nature, providing an explanation for the p-type behaviour of nominally undoped MoS2 films.
Keyword(s): Energy dispersive x-ray spectroscopy; Electron microscopy; Density functional theory; Hall effect; Interstitials; Molybdenum compounds; Rhenium; Scanning-transmission electron microscopy; Semiconductor doping; Semiconductor materials; Semiconductor thin films; Vacancies (crystal); X-ray chemical analysis
Publication Date:
 2017
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland
Citation(s): Hallam, T., Monaghan, S., Gity, F., Ansari, L., Schmidt, M., Downing, C., Cullen, C. P., Nicolosi, V., Hurley, P. K. and Duesberg, G. S. (2017) 'Rhenium-doped MoS2 films', Applied Physics Letters, 111(20), 203101 (5 pp). doi: 10.1063/1.4995220
Publisher(s): AIP Publishing
File Format(s): application/pdf
Related Link(s): http://aip.scitation.org/doi/abs/10.1063/1.4995220
First Indexed: 2017-11-25 06:56:25 Last Updated: 2017-11-25 06:56:25
University College Cork
Journal article
peer-reviewed
Science Foundation Ireland
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