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High-efficiency thermoelectrics with functionalized graphene.

Jeong Yun Kim1, Jeffrey C Grossman1

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

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Summary

Chemical functionalization of graphene superlattices enhances thermoelectric properties. This approach boosts the Seebeck coefficient and figure of merit, creating efficient graphene-based thermoelectric materials.

Keywords:
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene's unique electronic properties offer potential for thermoelectric applications.
  • Tuning thermal and electronic properties via surface nanopatterning is a key challenge.

Purpose of the Study:

  • To investigate the impact of chemical functionalization on graphene's thermoelectric performance.
  • To explore the potential of patterned graphene for efficient thermoelectric energy conversion.

Main Methods:

  • Utilized classical and quantum mechanical calculations.
  • Simulated the effects of chemical functionalization and nanopatterning on graphene's electronic and thermal properties.

Main Results:

  • Chemical functionalization introduced density of states peaks, significantly enhancing the Seebeck coefficient.
  • A twofold increase in the room-temperature power factor was observed compared to pristine graphene.
  • Reduced thermal conductivity and a figure of merit (ZT) up to ~3 at room temperature were predicted for functionalized graphene.

Conclusions:

  • Chemical functionalization is a viable strategy for optimizing graphene's thermoelectric properties.
  • Engineered graphene superlattices show promise for developing highly efficient thermoelectric materials.
  • This research opens avenues for advanced thermoelectric device applications using graphene.