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[Korean]
Thermoelectric Performance Enhancement of Sintered Bi-Te Pellets by Rotary-type Atomic Layer Deposition
Myeong Jun Jung, Ji Young Park, Su Min Eun, Byung Joon Choi
J Powder Mater. 2023;30(2):130-139.   Published online April 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.2.130
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AbstractAbstract PDF

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 к (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°C. 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.

Citations

Citations to this article as recorded by  
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    Applied Surface Science.2025; 692: 162730.     CrossRef
  • Investigation of the Thermal-to-Electrical Properties of Transition Metal-Sb Alloys Synthesized for Thermoelectric Applications
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    journal of Korean Powder Metallurgy Institute.2024; 31(3): 236.     CrossRef
  • Enhancing Electrical Properties of N-type Bismuth Telluride Alloys through Graphene Oxide Incorporation in Extrusion 3D Printing
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    journal of Korean Powder Metallurgy Institute.2023; 30(4): 318.     CrossRef

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