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Gate-Tunable Electrostatic Friction of Grain Boundary in Chemical-Vapor-Deposited MoS2

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Jeong, Jae Hwan; Jung, Yeonjoon; Park, Jang-Ung; Lee, Gwan-Hyoung

Issue Date
American Chemical Society
Nano Letters, Vol.23 No.7, pp.3085-3089
Two-dimensional (2D) semiconducting materials, such as MoS2, are widely studied owing to their great potential in advanced electronic devices. However, MoS2 films grown using chemical vapor deposition (CVD) exhibit lower-than-expected properties owing to numerous defects. Among them, grain boundary (GB) is a critical parameter that determines electrical and mechanical properties of MoS2. Herein, we report the gate-tunable electrostatic friction of GBs in CVD-grown MoS2. Using atomic force microscopy (AFM), we found that electrostatic friction of MoS2 is generated by the Coulomb interaction between tip and carriers of MoS2, which is associated with the local band structure of GBs. Therefore, electrostatic friction is enhanced by localized charge carrier distribution at GB, which is linearly related to the loading force of the tip. Our study shows a strong correlation between electrostatic friction and localized band structure in MoS2 GB, providing a novel method for identifying and characterizing GBs of polycrystalline 2D materials.
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Related Researcher

  • College of Engineering
  • Department of Materials Science & Engineering
Research Area 2D materials, 2차원 물질, Smiconductor process, semiconductor devices, 반도체 공정, 반도체 소자


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