Large variations in both dark- and photoconductivity in nanosheet networks as nanomaterial is varied from MoS2 to WTe2
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2015Access:
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Cunningham, G. Hanlon, D. McEvoy, N. Duesberg, G.S. Coleman, J.N., Large variations in both dark- and photoconductivity in nanosheet networks as nanomaterial is varied from MoS2 to WTe2, Nanoscale, 7, 1, 2015, 198 - 208Download Item:
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Abstract:
We have used solution processing techniques to fabricate thin-film networks of nanosheets of six different transition metal dichalcogenides; MoS2, MoSe2, MoTe2, WS2, WSe2 and WTe2. We have measured both the dark conductivity and the photoconductivity under broad band illumination in the intensity range from 0–1500 W m−2. The dark conductivity varied from [similar]10−6 S m−1 for MoS2 to [similar]1 S m−1 for WTe2, with an apparent exponential dependence on bandgap. All materials studied show photocurrents which rise slowly with time and depend sub-linearly on light intensity, both hallmarks of trap limited processes. Because the photoresponse depends relatively weakly on bandgap, the ratio of photo- to dark conductivity is largest for the sulphides because of their lower dark conductivities. As such, MoS2 and WS2 may be best suited to photo-detection applications. However, due to their lower bandgap and superior conductivity, WSe2 and WTe2 might prove more effective in other applications, for example in photovoltaic cells.
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Science Foundation Ireland (SFI)
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http://people.tcd.ie/colemajhttp://people.tcd.ie/duesberg
http://people.tcd.ie/mcevoyni
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Science Foundation Ireland (SFI)Type of material:
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Nanoscale7
1
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thin-film networks of nanosheetsDOI:
http://dx.doi.org/10.1039/c4nr04951aThe following license files are associated with this item: