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Imaging the Quantum Capacitance of Strained MoS2 Monolayers by Electrostatic Force Microscopy.

Cinzia Di Giorgio1,2, Elena Blundo3, Julien Basset2

  • 1Department of Physics E.R. Caianiello, University of Salerno, Fisciano, 84084, Italy.

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|January 18, 2024
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Summary

Radio frequency-assisted electrostatic force microscopy (RF-EFM) reveals the intrinsic quantum capacitance of strained molybdenum disulfide (MoS2) monolayers. This technique distinguishes quantum capacitance from defect contributions in semiconducting materials.

Keywords:
2D materialsElectrostatic Force MicroscopyMoS2Quantum CapacitanceStrain

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Molybdenum disulfide (MoS2) monolayers are semiconducting transition metal dichalcogenides with tunable optoelectronic properties.
  • Strain engineering is a key method to modify MoS2 properties for advanced applications.
  • Understanding charge carrier behavior in strained MoS2 is crucial for next-generation electronics.

Purpose of the Study:

  • To investigate the electric field response of biaxially strained MoS2 monolayers using RF-EFM.
  • To differentiate the intrinsic quantum capacitance of strained MoS2 from contributions of atomic-scale defects.
  • To develop a nanoscale, noninvasive imaging technique for probing quantum phenomena.

Main Methods:

  • Implementation of radio frequency-assisted electrostatic force microscopy (RF-EFM) at 300 MHz.
  • Production of strained MoS2 monolayers in mesoscopic bubbles via H-ion irradiation.
  • Simultaneous imaging of bubble topography and quantum capacitance.

Main Results:

  • RF-EFM successfully distinguished intrinsic quantum capacitance from defect-related capacitance in strained MoS2.
  • At high RF frequencies (300 MHz), defect contributions to capacitance and transport become negligible.
  • The technique allowed visualization of both topography and quantum capacitance at the nanoscale.

Conclusions:

  • RF-EFM is a powerful tool for probing the intrinsic electronic properties of strained 2D materials.
  • This method enables the study of time- and spatial-dependent phenomena like electron compressibility.
  • The technique offers a noninvasive approach to investigate quantum materials.