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Extraordinary Thermoelectric Performance Realized in n-Type PbTe through Multiphase Nanostructure Engineering.

Jian Zhang1,2, Di Wu1, Dongsheng He1

  • 1Shenzhen Key Laboratory of Thermoelectric Materials and Department of Physics, Southern University of Science and Technology, Shenzhen, 518055, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 24, 2017
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Summary

Researchers developed novel n-type lead telluride composites with indium antimonide (InSb) for superior thermoelectric performance. This breakthrough enhances thermoelectric devices by achieving a record ZT value, overcoming previous limitations in n-type materials.

Keywords:
energy filteringn-type PbTenanostructure engineeringthermoelectricstransmission electron microscopy

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Lead telluride (PbTe) is a prime thermoelectric material for intermediate temperatures, but its n-type form shows poor performance.
  • Commercialization of PbTe-based thermoelectrics is hindered by the limited efficiency of n-type variants.

Purpose of the Study:

  • To significantly improve the thermoelectric performance of n-type lead telluride.
  • To overcome the limitations of existing n-type PbTe materials for practical applications.

Main Methods:

  • Incorporation of indium antimonide (InSb) into a PbTe matrix to create multiphase nanostructures.
  • Investigating the impact of these nanostructures on electrical and thermal transport properties.

Main Results:

  • Achieved a record-high figure of merit (ZT) of approximately 1.83 at 773 K in n-type PbTe-4%InSb composites.
  • Multiphase nanostructures enhanced the Seebeck coefficient and reduced carrier mobility, boosting the power factor.
  • Intensive phase boundaries led to strengthened interface scattering, significantly lowering lattice thermal conductivity.

Conclusions:

  • The developed n-type PbTe-InSb composites demonstrate a record thermoelectric performance.
  • The strategy of creating multiphase nanostructures effectively enhances both electrical and thermal transport.
  • This approach holds promise for improving other advanced thermoelectric systems.