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Interstitials in Thermoelectrics.

Liqing Xu1,2, Zhanxiang Yin1, Yu Xiao1

  • 1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China.

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|May 30, 2024
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Summary
This summary is machine-generated.

Interstitial atoms significantly enhance thermoelectric materials by optimizing phonon and electron transport. This review highlights various interstitial types and their roles in improving thermoelectric performance for future material development.

Keywords:
carrier transportinterstitialsphonon propagationthermoelectric materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics

Background:

  • Defect structure, particularly interstitial atoms, is crucial for advancing thermoelectric materials.
  • Interstitials play key roles in optimizing both phonon and electron transport properties.

Purpose of the Study:

  • To provide a comprehensive overview of interstitial strategies in thermoelectric materials.
  • To highlight the significance of interstitials in optimizing thermoelectric parameters.
  • To discuss the potential of interstitial strategies in diverse thermoelectric systems.

Main Methods:

  • Classification of interstitial atoms based on their distinct roles (rattling, decoupling, interlayer, dynamic, liquid).
  • Analysis of how each interstitial type influences phonon and electron transport.
  • Review of existing literature on interstitial engineering in thermoelectrics.

Main Results:

  • Rattling interstitials scatter phonons via resonance.
  • Decoupling interstitials block phonons and enhance electron transport due to differing mean free paths.
  • Interlayer interstitials facilitate out-of-layer electron transport in layered compounds.
  • Dynamic interstitials tune carrier density and optimize electrical properties over a wide temperature range.
  • Liquid interstitials improve carrier mobility through homogeneous dispersion.

Conclusions:

  • All identified interstitial types positively impact thermoelectric performance by tuning transport parameters.
  • Interstitial engineering offers a promising avenue for developing high-performance thermoelectric materials.
  • Future research should explore extending interstitial strategies to a broader range of thermoelectric systems.