Journal
APL MATERIALS
Volume 2, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4900816
Keywords
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Funding
- MOE [Tier1 MOE2013-T1-2-235, Tier2 MOE2012-T2-2-049]
- National Research Foundation under NRF RF Award [NRFRF2010-07]
- A*Star SERC PSF grant [1321202101]
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High photoresponse can be achieved in monolayers of transition metal dichalcogenides. However, the response times are inconveniently limited by defects. Here, we report low temperature photoresponse of monolayer tungsten disulphide prepared by exfoliation and chemical vapour deposition (CVD) method. The exfoliated device exhibits n-type behaviour; while the CVD device exhibits intrinsic behaviour. In off state, the CVD device has four times larger ratio of photoresponse for laser on/off and photoresponse decay-rise times are 0.1 s (limited by our setup), while the exfoliated device has few seconds. These findings are discussed in terms of charge trapping and localization. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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