Vapor Deposition of Bilayer 3R MoS2 with Room-Temperature Ferroelectricity

Hanjun Jiang, Lei Li, Yao Wu, Ruihuan Duan, Kongyang Yi, Lishu Wu, Chao Zhu, Lei Luo, Manzhang Xu, Lu Zheng, Xuetao Gan, Wu Zhao, Xuewen Wang*, Zheng Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Two-dimensional ultrathin ferroelectrics have attracted much interest due to their potential application in high-density integration of non-volatile memory devices. Recently, 2D van der Waals ferroelectric based on interlayer translation has been reported in twisted bilayer h-BN and transition metal dichalcogenides (TMDs). However, sliding ferroelectricity is not well studied in non-twisted homo-bilayer TMD grown directly by chemical vapor deposition (CVD). In this paper, for the first time, experimental observation of a room-temperature out-of-plane ferroelectric switch in semiconducting bilayer 3R MoS2 synthesized by reverse-flow CVD is reported. Piezoelectric force microscopy (PFM) hysteretic loops and first principle calculations demonstrate that the ferroelectric nature and polarization switching processes are based on interlayer sliding. The vertical Au/3R MoS2/Pt device exhibits a switchable diode effect. Polarization modulated Schottky barrier height and polarization coupling of interfacial deep states trapping/detrapping may serve in coordination to determine switchable diode effect. The room-temperature ferroelectricity of CVD-grown MoS2 will proceed with the potential wafer-scale integration of 2D TMDs in the logic circuit.

Original languageEnglish
Article number2400670
JournalAdvanced Materials
Volume36
Issue number32
DOIs
Publication statusPublished - Aug 8 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 Wiley-VCH GmbH.

ASJC Scopus Subject Areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • bilayer 3R MoS
  • chemical vapor deposition
  • piezoelectric force microscopy
  • scanning Kelvin Probe microscopy
  • sliding ferroelectricity

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