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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Understanding carrier transport in transition metal dichalcogenides (TMDs) is crucial for their electronic device applications.
  • Previous experiments indicated activation hopping transport through localized S-vacancy states at low carrier density and room temperature.

Purpose of the Study:

  • To investigate the dominant carrier transport mechanism in TMDs at low carrier density and room temperature.
  • To elucidate the role of sulfur vacancies in conductivity and explore methods for tuning carrier mobility.

Main Methods:

  • A multiscale model combining ab initio calculations and Marcus theory was employed.
  • Analysis focused on identifying the hopping mechanism, path contributions, and hopping distances.
  • The dependence of mobility on defect concentration, temperature, and energy mismatch was studied.

Main Results:

  • Phonon-assisted hopping (PAH) was identified as the primary mechanism for activation hopping.
  • Macroscopic conductivity is significantly influenced by a few microscopic percolation paths.
  • Nearest-neighbor hopping behavior was observed, with mobility strongly affected by defect concentration, temperature, and energy mismatch.

Conclusions:

  • Phonon-assisted hopping is the key transport mechanism in TMDs under specific conditions.
  • Alloying presents a promising strategy for tuning carrier mobility by increasing energy mismatch effects.