Type

Journal Article

Authors

Jonathan N Coleman
Georg S Duesberg
Niall Mcevoy
Damien Hanlon
Graeme Cunningham

Subjects

Chemistry

Topics
detection photoconductivity materials transition metal photovoltaic cells thin film mos2 networks

Large variations in both dark- and photoconductivity in nanosheet networks as nanomaterial is varied from MoS2 to WTe2. (2014)

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 ∼ 10(-6) S m(-1) for MoS2 to ∼ 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.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Jonathan N Coleman, Georg S Duesberg, Niall Mcevoy, Damien Hanlon, Graeme Cunningham

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
3
Niall Mcevoy
Trinity College Dublin
Total Publications: 54
 
4
Damien Hanlon
Trinity College Dublin
Total Publications: 13