Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures

Xiaoping Hong, Jonghwan Kim, Su Fei Shi, Yu Zhang, Chenhao Jin, Yinghui Sun, Sefaattin Tongay, Junqiao Wu, Yanfeng Zhang, Feng Wang

Research output: Contribution to journalArticle

905 Citations (Scopus)

Abstract

Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional layers, including graphene, hexagonal-boron nitride and transition-metal dichalcogenides (MX2), give rise to fascinating new phenomena. MX2 heterostructures are particularly exciting for novel optoelectronic and photovoltaic applications, because two-dimensional MX 2 monolayers can have an optical bandgap in the near-infrared to visible spectral range and exhibit extremely strong light-matter interactions. Theory predicts that many stacked MX2 heterostructures form type II semiconductor heterojunctions that facilitate efficient electron-hole separation for light detection and harvesting. Here, we report the first experimental observation of ultrafast charge transfer in photoexcited MoS2/WS 2 heterostructures using both photoluminescence mapping and femtosecond pump-probe spectroscopy. We show that hole transfer from the MoS2 layer to the WS2 layer takes place within 50 fs after optical excitation, a remarkable rate for van der Waals coupled two-dimensional layers. Such ultrafast charge transfer in van der Waals heterostructures can enable novel two-dimensional devices for optoelectronics and light harvesting.

Original languageEnglish (US)
Pages (from-to)682-686
Number of pages5
JournalNature Nanotechnology
Volume9
Issue number9
DOIs
StatePublished - 2014

Fingerprint

Heterojunctions
Charge transfer
charge transfer
Optoelectronic devices
boron nitrides
heterojunctions
graphene
Graphite
Boron nitride
Photoexcitation
transition metals
Optical band gaps
pumps
photoluminescence
Graphene
Transition metals
probes
Monolayers
Photoluminescence
Pumps

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering
  • Materials Science(all)
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Hong, X., Kim, J., Shi, S. F., Zhang, Y., Jin, C., Sun, Y., ... Wang, F. (2014). Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures. Nature Nanotechnology, 9(9), 682-686. https://doi.org/10.1038/nnano.2014.167

Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures. / Hong, Xiaoping; Kim, Jonghwan; Shi, Su Fei; Zhang, Yu; Jin, Chenhao; Sun, Yinghui; Tongay, Sefaattin; Wu, Junqiao; Zhang, Yanfeng; Wang, Feng.

In: Nature Nanotechnology, Vol. 9, No. 9, 2014, p. 682-686.

Research output: Contribution to journalArticle

Hong, X, Kim, J, Shi, SF, Zhang, Y, Jin, C, Sun, Y, Tongay, S, Wu, J, Zhang, Y & Wang, F 2014, 'Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures', Nature Nanotechnology, vol. 9, no. 9, pp. 682-686. https://doi.org/10.1038/nnano.2014.167
Hong, Xiaoping ; Kim, Jonghwan ; Shi, Su Fei ; Zhang, Yu ; Jin, Chenhao ; Sun, Yinghui ; Tongay, Sefaattin ; Wu, Junqiao ; Zhang, Yanfeng ; Wang, Feng. / Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures. In: Nature Nanotechnology. 2014 ; Vol. 9, No. 9. pp. 682-686.
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