journal article·2024-04-10

Unlocking the Potential of Porous Bi2Te3-Based Thermoelectrics Using Precise Interface Engineering through Atomic Layer Deposition

Seunghyeok Lee, Gwang Min Park, Younghoon Kim, So-Hyeon Lee, Sung-Jin Jung, Junpyo Hong, Sung-Chul Kim, Sung Ok Won, Albert S. Lee, Yoon Jang Chung, Ju-Young Kim, Heesuk Kim, Seung-Hyub Baek, Jin-Sang Kim, Tae Joo Park, Seong Keun Kim

ACS Applied Materials & Interfaces· Volume 16· Issue 14
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Abstract

Porous thermoelectric materials offer exciting prospects for improving the thermoelectric performance by significantly reducing the thermal conductivity. Nevertheless, porous structures are affected by issues, including restricted enhancements in performance attributed to decreased electronic conductivity and degraded mechanical strength. This study introduces an innovative strategy for overcoming these challenges using porous Bi 0.4 Sb 1.6 Te 3 (BST) by combining porous structuring and interface engineering via atomic layer deposition (ALD). Porous BST powder was produced by selectively dissolving KCl in a milled mixture of BST and KCl; the interfaces were engineered by coating ZnO films through ALD. This novel architecture remarkably reduced the thermal conductivity owing to the presence of several nanopores and ZnO/BST heterointerfaces, promoting efficient phonon scattering. Additionally, the ZnO coating mitigated the high resistivity associated with the porous structure, resulting in an improved power factor. Consequently, the ZnO-coated porous BST demonstrated a remarkable enhancement in thermoelectric efficiency, with a maximum zT of approximately 1.53 in the temperature range of 333–353 K, and a zT of 1.44 at 298 K. Furthermore, this approach plays a significant role in enhancing the mechanical strength, effectively mitigating a critical limitation of porous structures. These findings open new avenues for the development of advanced porous thermoelectric materials and highlight their potential for precise interface engineering through the ALD.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal Radiation and Cooling Technologies · Thermal properties of materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea

Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, South Korea

KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, South Korea

Graduate School of Materials and Devices, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea

Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea

Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea

Convergence Research Center for Solutions to Electromagnetic Interference in Future-Mobility, Korea Institute of Science and Technology, Seoul 02792, South Korea

Advanced Analysis and Data Center, Korea Institute of Science and Technology, Seoul 02792, South Korea

Department of Chemical and Biological Engineering, Korea University, Seoul 02841, South Korea

Soft Hybrid Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea

Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Wanju 55324, South Korea

Funding

National Research Foundation of Korea · Korea Institute of Science and Technology

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