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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...

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Nuanced dilute doping strategy enables high-performance GeTe thermoelectrics.

Jinxuan Zhong1, Xiaoyu Yang2, Tu Lyu1

  • 1College of Materials Science and Engineering, Shenzhen Key Laboratory of Special Functional Materials, Guangdong Research Center for Interfacial Engineering of Functional Materials, Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China.

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Summary

A new dilute doping strategy in Germanium Telluride (GeTe) enhances thermoelectric performance by optimizing carrier concentration and reducing thermal conductivity. This approach achieves a figure of merit of 2.03 at 623 K, boosting energy conversion efficiency.

Keywords:
Dilute dopingGeTeInterstitial atomsLattice softeningThermoelectric

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Thermoelectric materials require doping to enhance their figure of merit, crucial for energy conversion.
  • Traditional heavy doping strategies often hinder carrier transport due to point defect scattering.
  • Dilute doping typically optimizes carrier mobility but fails to improve other key thermoelectric parameters.

Purpose of the Study:

  • To develop a nuanced dilute doping strategy for Germanium Telluride (GeTe) using small-size metal atoms.
  • To concurrently optimize carrier concentration, carrier transport, and lattice thermal conductivity.
  • To investigate the impact of dilute doping on microstructural evolution and thermoelectric properties.

Main Methods:

  • Introduction of 4% CuPbSbTe3 into GeTe to suppress rhombohedral distortion and optimize carrier concentration via Cu interstitials.
  • Formation of multiscale microstructures: zero-dimensional (Cu interstitials), one-dimensional (dislocations), two-dimensional (planar defects), and three-dimensional (nanoscale precipitates).
  • Subsequent trace Cadmium (Cd) doping to mitigate bipolar effects and align valence bands.

Main Results:

  • A figure of merit (ZT) of 2.03 was achieved at 623 K in (Ge0.97Cd0.03Te)0.96(CuPbSbTe3)0.04.
  • Ultralow lattice thermal conductivity was realized due to lattice softening and multiscale microstructures.
  • High energy-conversion efficiency (7.9%) and power density (3.44 W cm−2) were demonstrated at a 500 K temperature difference.
  • Dilute doping resulted in only a marginal decrease in carrier mobility.

Conclusions:

  • Nuanced dilute doping with small-size metal atoms is an effective strategy for enhancing thermoelectric performance in GeTe.
  • The concurrent tuning of carrier and phonon transport through microstructural engineering is key to achieving high thermoelectric figures of merit.
  • This approach offers valuable insights for designing advanced thermoelectric materials for efficient energy conversion.