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PbS-Pb-CuS Composites for Thermoelectric Application.

Mengyao Li1, Yu Liu2,3, Yu Zhang1

  • 1Catalonia Energy Research Institute─IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain.

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Summary

This study developed novel lead sulfide (PbS) based semiconductor-metal composites for improved thermoelectric performance. The addition of copper (Cu) nanoparticles significantly enhanced the thermoelectric figure of merit (ZT) by 400%.

Keywords:
CuxSPbSenergy conversionnanocompositenanoparticlesolution synthesisthermoelectric

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermoelectric Materials

Background:

  • Composite materials offer advantages in thermoelectric applications.
  • Lead sulfide (PbS) is a promising thermoelectric material.
  • Enhancing the thermoelectric performance of PbS is crucial for practical applications.

Purpose of the Study:

  • To develop novel semiconductor-metal composites for improved thermoelectric properties.
  • To investigate the effect of copper (Cu) addition on the thermoelectric performance of PbS.
  • To understand the mechanisms behind the enhanced thermoelectric properties.

Main Methods:

  • Synthesis of PbS-Cu composites by blending PbS and Cu nanoparticles.
  • Annealing in a reducing atmosphere to form PbS-Pb-Cu₂S composites.
  • Consolidation using spark plasma sintering (SPS).

Main Results:

  • Formation of PbS-Pb-Cu₂S composites with liquid-phase sintering enabled by metallic lead.
  • Increased charge carrier concentration due to lead's low work function, boosting electrical conductivity.
  • Achieved a peak thermoelectric figure of merit (ZT) of 1.1 at 750 K, a 400% increase over bare PbS.

Conclusions:

  • The addition of metallic copper significantly enhances the thermoelectric performance of PbS.
  • The formation of multiple phases and increased carrier concentration are key to improved performance.
  • The developed composites show promising potential for efficient thermoelectric energy conversion.