Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers
- Authors
- Yu, WJ[Yu, Woo Jong]; Vu, QA[Quoc An Vu]; Oh, H[Oh, Hyemin]; Nam, HG[Nam, Hong Gi]; Zhou, HL[Zhou, Hailong]; Cha, S[Cha, Soonyoung]; Kim, JY[Kim, Joo-Youn]; Carvalho, A[Carvalho, Alexandra]; Jeong, M[Jeong, Munseok]; Choi, H[Choi, Hyunyong]; Neto, AHC[Castro Neto, A. H.]; Lee, YH[Lee, Young Hee]; Duan, XF[Duan, Xiangfeng]
- Issue Date
- 9-Nov-2016
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.7
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 7
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/34377
- DOI
- 10.1038/ncomms13278
- ISSN
- 2041-1723
- 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.
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- Appears in
Collections - Science > Department of Physics > 1. Journal Articles
- Graduate School > Energy Science > 1. Journal Articles
- Information and Communication Engineering > School of Electronic and Electrical Engineering > 1. Journal Articles
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