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나노 구조 물리 연구단
나노구조물리 연구단
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Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers

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Title
Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers
Author(s)
Woo Jong Yu; Quoc An Vu; Hye Min Oh; Honggi Nam; Hailong Zhou; Soonyoung Cha; Joo-Youn Kim; Alexandra Carvalho; Mun Seok Jeong; Hyunyong Choi; A.H. Castro Neto; Young Hee Lee; Xiangfeng Duan
Publication Date
2016-11
Journal
NATURE COMMUNICATIONS, v.7, no., pp.13278 -
Publisher
NATURE PUBLISHING GROUP
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/MoS2/graphene heterostructures by creating a device with two distinct regions containing one-layer and seven-layer MoS2 to exclude other extrinsic factors. Photoresponse studies reveal that photoresponsivity in one-layer MoS2 is surprisingly higher than that in seven-layer MoS2 by seven times. Spectral-dependent studies further show that the internal quantum efficiency in one-layer MoS2 can reach a maximum of 65%, far higher than the 7% in seven-layer MoS2. Our theoretical modelling shows that asymmetric potential barriers in the top and bottom interfaces of the graphene/one-layer MoS2/graphene heterojunction enable asymmetric carrier tunnelling, to generate usually high photoresponsivity in one-layer MoS2 device. (c) The Author(s) 2016
URI
http://pr.ibs.re.kr/handle/8788114/3250
DOI
10.1038/ncomms13278
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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