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High-Performance Flexible Bismuth Telluride Thin Film from Solution Processed Colloidal Nanoplates.

Courtney Hollar1, Zhaoyang Lin2, Madhusudan Kongara3

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|March 19, 2021
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Summary

Flexible bismuth telluride thin films were developed for wearable thermoelectric generators. These films demonstrate high performance and durability, paving the way for low-cost, body-heat-powered electronics.

Keywords:
Thermoelectricsaerosol jet printingbismuth tellurideflexible thermoelectrics

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Energy Conversion

Background:

  • Thermoelectric generators offer eco-friendly solid-state energy conversion.
  • Flexible thermoelectric generators are ideal for powering wearable electronics using ambient heat.
  • Bismuth telluride materials perform optimally near room temperature, suiting body heat applications.

Purpose of the Study:

  • To develop flexible bismuth telluride (Bi2Te3) thin films for thermoelectric generators.
  • To utilize low-cost, scalable manufacturing methods for Bi2Te3 thin film deposition.
  • To assess the thermoelectric performance and mechanical flexibility of the fabricated films.

Main Methods:

  • Bi2Te3 thin films were synthesized and deposited on flexible polyimide substrates.
  • Nanocrystal dimensions were characterized (35 ± 15 nm thickness, 692 ± 186 nm lateral).
  • Aerosol jet printing was employed for fabricating thermoelectric thin films.

Main Results:

  • The Bi2Te3 thin films achieved a peak power factor of 0.35 mW/m·K² at 433 K.
  • The films maintained 77% of their initial electrical resistance after 1000 bending cycles (50mm ROC).
  • High thermoelectric performance was demonstrated on flexible substrates using scalable methods.

Conclusions:

  • Flexible Bi2Te3 thin films exhibit promising thermoelectric properties and mechanical robustness.
  • Additive manufacturing techniques like aerosol jet printing are viable for creating flexible thermoelectric generators.
  • These advancements support the development of efficient, body-heat-powered wearable devices.