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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Mott variable-range hopping transport in a MoS2 nanoflake.

Jianhong Xue1, Shaoyun Huang1, Ji-Yin Wang1

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Transport in disordered MoS2 nanoflakes was studied. At high temperatures, thermal activation dominates. At low temperatures, 2D Mott variable-range hopping (VRH) governs transport, confirmed by magnetoresistance measurements.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Understanding charge transport in low-dimensional materials is crucial for electronic applications.
  • Disordered multilayered molybdenum disulfide (MoS2) nanoflakes present unique transport properties due to their complex structure.

Purpose of the Study:

  • To investigate the electrical and magnetotransport characteristics of disordered, multilayered MoS2 nanoflakes in the insulator regime.
  • To elucidate the dominant charge transport mechanisms across a wide temperature range.

Main Methods:

  • Electrical transport measurements using a four-probe setup.
  • Magnetoresistance measurements under varying magnetic fields and temperatures.
  • Exfoliation of MoS2 nanoflakes from bulk MoS2 crystals.

Main Results:

  • At high temperatures, conductance (G) follows a ln G ~ -T^-1 dependence, indicating thermal activation.
  • At low temperatures, conductance exhibits a ln G ~ -T^-1/3 dependence, characteristic of two-dimensional (2D) Mott variable-range hopping (VRH).
  • Low-field magnetoresistance shows a quadratic magnetic field dependence (~ αB^2 with α ~ T^-1), consistent with 2D Mott VRH.

Conclusions:

  • The study confirms 2D Mott VRH as the dominant transport mechanism in disordered MoS2 nanoflakes at low temperatures.
  • Magnetotransport measurements provide strong evidence supporting the observed VRH transport behavior.
  • These findings contribute to the understanding of charge transport in complex 2D materials.