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A Strategy for Fabricating Ultra-Flexible Thermoelectric Films Using Ag2Se-Based Ink.

Yunhuan Yuan1, Chaogang Ding2, Rui Yin1

  • 1Flexible Printed Electronics Technology Center, Harbin Institute of Technology, Shenzhen 518055, China.

Materials (Basel, Switzerland)
|August 10, 2024
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Summary

Researchers developed a printable silver selenide (Ag2Se) ink for flexible thermoelectric films. This cost-effective method enables large-scale production of high-performance, flexible thermoelectric devices for wearable electronics.

Keywords:
flexible thermoelectric materialslow-temperature sinteringprintable inkprinted filmscreen printing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • Flexible thermoelectric materials are crucial for wearable electronics and IoT devices.
  • Current fabrication methods face challenges in cost-effectiveness, scalability, and achieving both performance and flexibility.
  • Developing efficient, large-scale production techniques for these materials is a significant research gap.

Purpose of the Study:

  • To develop a cost-effective and scalable method for fabricating flexible thermoelectric films.
  • To create a printable Ag2Se-based ink suitable for screen printing and low-temperature sintering.
  • To evaluate the thermoelectric performance and mechanical flexibility of the fabricated films.

Main Methods:

  • Development of a silver selenide (Ag2Se)-based ink with high printability.
  • Fabrication of flexible thermoelectric films using screen printing and low-temperature sintering.
  • Characterization of thermoelectric properties (Seebeck coefficient, power factor) and mechanical flexibility (bending tests).

Main Results:

  • The screen-printed Ag2Se films exhibited a Seebeck coefficient of -161 μV/K and a power factor of 3250.9 μW/m·K² at 400 K.
  • The films demonstrated excellent flexibility, with minimal resistance change after 5000 bending cycles (5 mm radius).
  • The developed ink and fabrication process proved effective for large-scale, patterned production.

Conclusions:

  • A novel Ag2Se-based ink enables cost-effective, large-scale, patterned fabrication of flexible thermoelectric films.
  • The fabricated films possess excellent thermoelectric performance and remarkable mechanical flexibility.
  • This research opens new avenues for the practical application of flexible thermoelectric generators in wearable technology.