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Doping graphene enhances conductivity for applications, but high concentrations lead to dopant clustering. This clustering affects charge transfer and carrier transport, revealing optimal doping levels for improved graphene performance.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene requires extrinsic doping to boost its conductivity for applications like electrodes and transparent conductors.
  • Understanding doping mechanisms under application-relevant conditions is crucial but limited.

Purpose of the Study:

  • To investigate the fundamental mechanisms limiting graphene doping effectiveness at various concentrations.
  • To identify optimal doping densities and suitable dopants for graphene.

Main Methods:

  • In-situ carrier transport measurements.
  • Raman characterization of graphene with different dopants.
  • Analysis of dopant clustering and its impact on electronic properties.

Main Results:

  • Three transport regimes were identified with increasing dopant concentration.
  • Dopant agglomeration into clusters initially enhances conductivity.
  • Polarization effects and percolative transport emerge at higher concentrations, altering charge transfer and Hall effect.

Conclusions:

  • Dopant clustering influences graphene conductivity through ordered scattering and polarization effects.
  • Optimal doping density ranges exist, and understanding these mechanisms guides dopant selection for graphene applications.