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Ternary Bi2Te3In2Te3Ga2Te3 (n-type) thermoelectric film on a flexible PET substrate for use in wearables

Author

Listed:
  • Kim, Sang Hoon
  • Min, Taesik
  • Choi, Jae Won
  • Baek, Seon Hwa
  • Choi, Joon-Phil
  • Aranas, Clodualdo

Abstract

An amorphous structure of BiInGaTe powders with a small size of 10–45 μm and a low melting point of 93.2 °C is fabricated using a gas atomization technique. It is patterned using a roll-to-plate printer and then reflowed at 110 °C to become thin Bi2Te3In2Te3Ga2Te3 thermoelectric film on a flexible polyethylene terephthalate (PET) substrate. Subsequently, the electrical conductivity of the Bi2Te3In2Te3Ga2Te3 thermoelectric film increased from 6.7 × 104 S m−1 to 9.6 × 104 S m−1 and its thermal conductivity even more significantly increased from 0.9 W m−1 K−1 to 1.8 W m−1 K−1 compared to the Bi2Te3 thermoelectric film. As a result, we obtained a relatively low figure of merit (ZT) value (0.3 at 298.15 K) for the novel thermoelectric film. However, all of these results were irrelevant to the intensive phonon scattering at the hierarchical interfacial boundaries, which included the macro-scale phase boundaries of Bi2Te3/In2Te3Ga2Te3 and the nano-scale grain boundaries of each Bi2Te3, In2Te3, and Ga2Te3. As a consequence, the reduction of the ZT value of the proposed novel thermoelectric film can be attributed to the addition of In and Ga with high electrical and thermal conductivity.

Suggested Citation

  • Kim, Sang Hoon & Min, Taesik & Choi, Jae Won & Baek, Seon Hwa & Choi, Joon-Phil & Aranas, Clodualdo, 2018. "Ternary Bi2Te3In2Te3Ga2Te3 (n-type) thermoelectric film on a flexible PET substrate for use in wearables," Energy, Elsevier, vol. 144(C), pages 607-618.
    • Handle: RePEc:eee:energy:v:144:y:2018:i:c:p:607-618
    DOI: 10.1016/j.energy.2017.12.063
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    References listed on IDEAS

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    1. Tan, Ming & Deng, Yuan & Hao, Yanming, 2014. "Improved thermoelectric performance of a film device induced by densely columnar Cu electrode," Energy, Elsevier, vol. 70(C), pages 143-148.
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    Cited by:

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