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Thermoelectric power in graphene.

W S Bao1, S Y Liu, X L Lei

  • 1Department of Physics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China. watson bob@sjtu.edu.cn

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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This study examines thermoelectric power (TEP) in graphene, finding that phonon-drag effects are negligible above 10 K but create a distinct peak below this temperature due to phonon-phonon interactions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Thermoelectric power (TEP) is crucial for energy harvesting and cooling applications.
  • Understanding charge carrier scattering mechanisms in 2D materials like graphene is key to optimizing thermoelectric performance.
  • Graphene's unique electronic properties make it a promising candidate for advanced thermoelectric devices.

Purpose of the Study:

  • To theoretically investigate thermoelectric power (TEP) in single-layer graphene.
  • To analyze the influence of electron-impurity and electron-phonon scattering on TEP.
  • To explore the temperature-dependent behavior of TEP, particularly the role of phonon-drag effects.

Main Methods:

  • Utilized a balance-equation-based theoretical framework.
  • Incorporated electron-impurity and electron-phonon scattering mechanisms.
  • Accounted for boundary scattering and phonon-phonon interactions in phonon relaxation processes.

Main Results:

  • At temperatures above 10 K, diffusive processes dominate TEP, with negligible phonon-drag contribution.
  • Below 10 K, phonon-phonon interactions induce a significant phonon-drag peak in the temperature dependence of TEP.
  • Theoretical predictions were compared against experimental data.

Conclusions:

  • The temperature regime significantly impacts the dominant scattering mechanisms governing TEP in graphene.
  • Phonon-drag effects become prominent at low temperatures (≤ 10 K), influencing TEP.
  • The theoretical model provides valuable insights for understanding and potentially enhancing thermoelectric properties of graphene.