Please use this identifier to cite or link to this item: https://doi.org/10.1038/ncomms13278
Title: Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers
Authors: Yu, W.J
Vu, Q.A
Oh, H
Nam, H.G
Zhou, H
Cha, S
Kim, J.-Y
Carvalho, A 
Jeong, M
Choi, H
Castro Neto, A.H 
Lee, Y.H
Duan, X
Keywords: graphene
molybdenum
carbon
design method
electronic equipment
extraction method
spectral analysis
theoretical study
Article
chemical structure
electric conductivity
electric current
electric potential
electron
photon
photoreactivity
quantum mechanics
semiconductor
short circuit current
theoretical model
van der Waal heterostructure
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Yu, W.J, Vu, Q.A, Oh, H, Nam, H.G, Zhou, H, Cha, S, Kim, J.-Y, Carvalho, A, Jeong, M, Choi, H, Castro Neto, A.H, Lee, Y.H, Duan, X (2016). Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers. Nature Communications 7 : 13278. ScholarBank@NUS Repository. https://doi.org/10.1038/ncomms13278
Abstract: Two-dimensional layered transition-metal dichalcogenides have attracted considerable interest for their unique layer-number-dependent properties. In particular, vertical integration of these two-dimensional crystals to form van der Waals heterostructures can open up a new dimension for the design of functional electronic and optoelectronic devices. Here we report the layer-number-dependent photocurrent generation in graphene/MoS 2 /graphene heterostructures by creating a device with two distinct regions containing one-layer and seven-layer MoS 2 to exclude other extrinsic factors. Photoresponse studies reveal that photoresponsivity in one-layer MoS 2 is surprisingly higher than that in seven-layer MoS 2 by seven times. Spectral-dependent studies further show that the internal quantum efficiency in one-layer MoS 2 can reach a maximum of 65%, far higher than the 7% in seven-layer MoS 2. Our theoretical modelling shows that asymmetric potential barriers in the top and bottom interfaces of the graphene/one-layer MoS 2 /graphene heterojunction enable asymmetric carrier tunnelling, to generate usually high photoresponsivity in one-layer MoS 2 device. © The Author(s) 2016.
Source Title: Nature Communications
URI: https://scholarbank.nus.edu.sg/handle/10635/174920
ISSN: 20411723
DOI: 10.1038/ncomms13278
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