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Thermoelectric Flexible Silver Selenide Films: Compositional and Length Optimization.

Jie Gao1, Lei Miao1, Huajun Lai1

  • 1Guangxi Key Laboratory of Information Material, Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.

Iscience
|December 30, 2019
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Summary

Researchers enhanced silver selenide flexible films for improved thermoelectric performance. They achieved a power factor close to bulk silver selenide, enabling high-performance flexible thermoelectric devices.

Keywords:
Electrochemical Materials ScienceEnergy MaterialsMaterials Synthesis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Science

Background:

  • Silver selenide (Ag2Se) is a promising thermoelectric material.
  • Flexible Ag2Se films show lower thermoelectric performance than bulk materials.

Purpose of the Study:

  • To enhance the thermoelectric performance of paper-supported silver selenide flexible films.
  • To fabricate high-performance flexible thermoelectric devices based on Ag2Se films.

Main Methods:

  • Modulating film composition via reactant ratio and annealing treatments.
  • Fabricating a thermoelectric device optimized using numerical simulation.
  • Characterizing thermoelectric properties including power factor and power density.

Main Results:

  • Achieved a power factor of 2450.9 ± 364.4 μW/(mK²) at 303 K, comparable to bulk Ag2Se.
  • Developed a flexible thermoelectric device with a maximum power density of 5.80 W/m² at a 25 K temperature difference.
  • Demonstrated superior performance compared to previous flexible film thermoelectric devices.

Conclusions:

  • Successfully modulated silver selenide film composition for enhanced thermoelectric properties.
  • Provided an effective method for creating high-performance flexible silver selenide thermoelectric films and devices.
  • Opened avenues for advanced flexible thermoelectric applications.