Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers

Woo Jong Yu (), Quoc An Vu, Hyemin Oh, Hong Gi Nam, Hailong Zhou, Soonyoung Cha, Joo-Youn Kim, Alexandra Carvalho, Munseok Jeong, Hyunyong Choi, A. H. Castro Neto, Young Hee Lee () and Xiangfeng Duan ()
Additional contact information
Woo Jong Yu: University of California
Quoc An Vu: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
Hyemin Oh: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
Hong Gi Nam: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
Hailong Zhou: University of California
Soonyoung Cha: School of Electrical and Electronic Engineering, Yonsei University
Joo-Youn Kim: School of Electrical and Electronic Engineering, Yonsei University
Alexandra Carvalho: Centre for Advanced 2D Materials, National University of Singapore
Munseok Jeong: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
Hyunyong Choi: School of Electrical and Electronic Engineering, Yonsei University
A. H. Castro Neto: Centre for Advanced 2D Materials, National University of Singapore
Young Hee Lee: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
Xiangfeng Duan: University of California

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/ncomms13278 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13278

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms13278

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().