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Chemical modulation and defect engineering in high-performance GeTe-based thermoelectrics.

Yilin Jiang1, Jincheng Yu1, Hezhang Li1,2

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Germanium telluride (GeTe) shows great promise for sustainable clean energy applications. This review details GeTe

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Sustainable Energy

Background:

  • Thermoelectric technology is crucial for clean energy and reducing carbon emissions.
  • Germanium telluride (GeTe) is a promising mid-temperature thermoelectric material with a high figure of merit (ZT) of 2.7.

Purpose of the Study:

  • To provide a comprehensive review of GeTe thermoelectric materials.
  • To elucidate the mechanisms behind GeTe's exceptional performance.
  • To summarize advancements and future trends for practical applications.

Main Methods:

  • Detailed analysis of GeTe's crystal structure, chemical bonding, band structure, and phonon dynamics.
  • Exploration of property optimization strategies, including band structure modulation, carrier concentration engineering, and defect structure incorporation.
  • Review of current research on GeTe devices and modules.

Main Results:

  • GeTe exhibits remarkable thermoelectric performance due to its unique properties and phase transition.
  • Strategies for enhancing electrical properties include band structure modulation and carrier engineering.
  • Phonon transport can be effectively managed through defect engineering and hierarchical architectures.

Conclusions:

  • GeTe is a key material for mid-temperature thermoelectric applications, contributing to sustainable energy solutions.
  • Optimizing electrical and thermal transport properties through various strategies is essential for maximizing performance.
  • Further development in GeTe devices and modules will accelerate its practical application in clean energy.