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Grain boundaries (GBs) in polycrystalline graphene (PG) significantly impact electronic properties. This study reveals that GB topology and realistic defects influence charge transport, affecting electronic mobilities in PG.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Nanoscience

Background:

  • Graphene synthesis methods like chemical vapor deposition produce polycrystalline flakes with grain boundaries (GBs).
  • These GBs, composed of pentagon-heptagon pairs, act as scattering sites, reducing electronic mobilities in polycrystalline graphene (PG).

Purpose of the Study:

  • To investigate charge transport mechanisms through grain boundaries in polycrystalline graphene.
  • To explore the impact of GB topology and realistic structural defects on electronic transport properties.

Main Methods:

  • Utilizing first-principles simulations based on the Landauer-Büttiker formalism.
  • Implementing the Green's function approach for accurate charge transport calculations.
  • Modeling ideal and realistic grain boundary configurations, including vacancies and buckling.

Main Results:

  • Electronic transport through GBs is dependent on their specific topology.
  • Realistic GBs with complex periodicities can lead to leakage currents.
  • Charge redistribution effects, influenced by GB topology, significantly alter transmission at specific energies.
  • The transport gap is inversely proportional to the smallest periodic pattern of the GB.

Conclusions:

  • The detailed topology of grain boundaries and realistic defects critically influence charge transport in polycrystalline graphene.
  • Understanding these factors is crucial for predicting and controlling the electronic properties of graphene materials for applications.