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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Coupled Vacancy and Phonon-Scattering Engineering Drive Defect Evolution Toward Multifunctional High-Performance

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  • 1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, China.

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Summary
This summary is machine-generated.

This study enhances thermoelectric materials using ZnSb and Se dopants for efficient solid-state cooling and heat harvesting. The optimized bismuth telluride compound shows improved performance and mechanical strength for practical applications.

Keywords:
Bi2Te3‐based materialsmultifunctional thermoelectric devicesphonon scatteringswapped bilayer structuresthermoelectricsvacancy compensation

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Sustainable Energy

Background:

  • Bismuth telluride (Bi2Te3)-based compounds are key for near-room-temperature thermoelectric applications.
  • Current limitations include moderate efficiency, poor mechanical robustness, and limited multifunctionality.

Purpose of the Study:

  • To develop a dual-regulation strategy using ZnSb and Se dopants to improve carrier and phonon transport in Bi2Te3-based materials.
  • To enhance thermoelectric performance, mechanical properties, and device functionality.

Main Methods:

  • Integration of intermetallic ZnSb and Se dopants into Bi0.4Sb1.6Te3.01.
  • Synergistic modulation of carrier concentration and phonon scattering.
  • Characterization of thermoelectric properties (Seebeck coefficient, power factor, zT), mechanical strength (Vickers hardness, compressive strength), and device performance (cooling temperature difference, power generation efficiency).

Main Results:

  • Optimized composition (Bi0.4Sb1.6Te2.97Se0.04 + 0.15% ZnSb) achieved a peak thermoelectric figure of merit (zT) of ~1.51 at 353 K.
  • Demonstrated enhanced mechanical properties with Vickers hardness of ~97 Hv and compressive strength of ~188 MPa.
  • A multifunctional device achieved a ~70 K cooling temperature difference and ~7.1% power generation efficiency.

Conclusions:

  • The dual-regulation strategy effectively enhances thermoelectric performance and mechanical integrity.
  • The developed materials and design framework enable practical, multifunctional Bi2Te3-based thermoelectric devices for cooling and energy harvesting.
  • Achieved exceptional stability for room-temperature wearable applications.