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Thermoelectric Cooling Performance Enhancement in BiSeTe Alloy by Microstructure Modulation via Hot Extrusion.

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Hot extrusion enhances bismuth telluride-based thermoelectric materials. This process improves charge carrier mobility and cooling performance in thermoelectric (TE) devices, surpassing commercial standards for next-generation TE cooling applications.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Growing demand for high-performance thermoelectric (TE) materials.
  • Need for enhanced commercialized Bismuth Telluride (Bi2Te3)-based TE materials.
  • Focus on improving n-type Bi2Te3-based materials for better efficiency.

Purpose of the Study:

  • To improve the performance of n-type Bi2Te2.8Se0.2S0.01 thermoelectric material.
  • To investigate the effect of a hot extrusion manufacturing process on material properties.
  • To fabricate and evaluate thermoelectric cooling modules using the enhanced material.

Main Methods:

  • Implementation of a hot extrusion manufacturing process on n-type Bi2Te2.8Se0.2S0.01.
  • Microstructural analysis to observe grain growth and preferred orientations.
  • Characterization of thermoelectric properties including power factor and figure of merit (zT).
  • Fabrication of full-scale cooling modules for performance testing.

Main Results:

  • Hot extrusion yielded a microstructure with enlarged grains and preferred orientations, reducing defects.
  • Achieved significantly enhanced charge carrier mobility, resulting in an ultrahigh power factor of ~51 μW cm⁻¹ K⁻².
  • Maximum figure of merit (zT) of 1.12 at 348 K was obtained through extrusion and annealing.
  • Fabricated cooling modules demonstrated a record maximum temperature difference (ΔT) of 73.9 K and cooling power density of 2.2 W cm⁻².

Conclusions:

  • The hot extrusion process significantly enhances the thermoelectric performance of n-type Bi2Te2.8Se0.2S0.01.
  • The optimized material and cooling modules surpass current commercial thermoelectric devices.
  • This advancement holds significant potential for next-generation thermoelectric cooling applications.