Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Thermoelectric Performance Enhancement of Sintered Bi-Te Pellets by Rotary-type Atomic Layer Deposition

로터리형 원자층 증착법을 이용한 Bi-Te계 소결체의 열전 성능 개선

  • Myeong Jun Jung (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Ji Young Park (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Su Min Eun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Byung Joon Choi (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 정명준 (서울과학기술대학교 신소재공학과) ;
  • 박지영 (서울과학기술대학교 신소재공학과) ;
  • 은수민 (서울과학기술대학교 신소재공학과) ;
  • 최병준 (서울과학기술대학교 신소재공학과)
  • Received : 2023.04.13
  • Accepted : 2023.04.20
  • Published : 2023.04.28
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Abstract

Thermoelectric materials and devices are energy-harvesting devices that can effectively recycle waste heat into electricity. Thermoelectric power generation is widely used in factories, engines, and even in human bodies as they continuously generate heat. However, thermoelectric elements exhibit poor performance and low energy efficiency; research is being conducted to find new materials or improve the thermoelectric performance of existing materials, that is, by ensuring a high figure-of-merit (zT) value. For increasing zT, higher σ (electrical conductivity) and S (Seebeck coefficient) and a lower κ (thermal conductivity) are required. Here, interface engineering by atomic layer deposition (ALD) is used to increase zT of n-type BiTeSe (BTS) thermoelectric powders. ALD of the BTS powders is performed in a rotary-type ALD reactor, and 40 to 100 ALD cycles of ZnO thin films are conducted at 100℃. The physical and chemical properties and thermoelectric performance of the ALD-coated BTS powders and pellets are characterized. It is revealed that electrical conductivity and thermal conductivity are decoupled, and thus, zT of ALD-coated BTS pellets is increased by more than 60% compared to that of the uncoated BTS pellets. This result can be utilized in a novel method for improving the thermoelectric efficiency in materials processing.

Keywords

Acknowledgement

이 연구는 한국연구재단의 중견연구자지원사업(NRF-2023R1A2C1006831)과 기초연구실사업(2022R1A4A5033917)의 지원으로 수행되었습니다.

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