Charge Transport in MoS2/WSe2van der Waals Heterostructure with Tunable Inversion Layer

Manh Ha Doan, Youngjo Jin, Subash Adhikari, Sanghyub Lee, Jiong Zhao, Seong Chu Lim, Young Hee Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

105 Citations (Scopus)

Abstract

Despite numerous studies on two-dimensional van der Waals heterostructures, a full understanding of the charge transport and photoinduced current mechanisms in these structures, in particular, associated with charge depletion/inversion layers at the interface remains elusive. Here, we investigate transport properties of a prototype multilayer MoS2/WSe2heterojunction via a tunable charge inversion/depletion layer. A charge inversion layer was constructed at the surface of WSe2due to its relatively low doping concentration compared to that of MoS2, which can be tuned by the back-gate bias. The depletion region was limited within a few nanometers in the MoS2side, while charges are fully depleted on the whole WSe2side, which are determined by Raman spectroscopy and transport measurements. Charge transport through the heterojunction was influenced by the presence of the inversion layer and involves two regimes of tunneling and recombination. Furthermore, photocurrent measurements clearly revealed recombination and space-charge-limited behaviors, similar to those of the heterostructures built from organic semiconductors. This contributes to research of various other types of heterostructures and can be further applied for electronic and optoelectronic devices.
Original languageEnglish
Pages (from-to)3832-3840
Number of pages9
JournalACS Nano
Volume11
Issue number4
DOIs
Publication statusPublished - 25 Apr 2017
Externally publishedYes

Keywords

  • charge transfer
  • inversion layer
  • photocurrent
  • recombination
  • tunneling
  • vdW heterostructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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