CALPHAD accelerated design of advanced full-Zintl thermoelectric device

Li Yin, Xiaofang Li, Xin Bao, Jinxuan Cheng, Chen Chen, Zongwei Zhang, Xingjun Liu, Feng Cao, Jun Mao and Qian Zhang ()
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Li Yin: Harbin Institute of Technology
Xiaofang Li: Harbin Institute of Technology
Xin Bao: Harbin Institute of Technology
Jinxuan Cheng: Harbin Institute of Technology
Chen Chen: Great Bay University
Zongwei Zhang: Chinese Academy of Sciences
Xingjun Liu: Harbin Institute of Technology
Feng Cao: Harbin Institute of Technology
Jun Mao: Harbin Institute of Technology
Qian Zhang: Harbin Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Since thermoelectric materials have different physical and chemical properties, the design of contact layers requires dedicated efforts, and the welding temperatures are distinctly different. Therefore, a general interface design and connection technology can greatly facilitate the development of thermoelectric devices. Herein, we proposed a screening strategy for the contact materials based on the calculation of phase diagram method, and Mg2Ni has been identified as a matched contact layer for n-type Mg3Sb2-based materials. And this screening strategy can be effectively applied to other thermoelectric materials. By adopting the low-temperature sintering silver nanoparticles technology, the Zintl phase thermoelectric device can be fabricated at low temperature but operate at medium temperature. The single-leg n-type Mg3.15Co0.05SbBi0.99Se0.01 device achieves an efficiency of ~13.3%, and a high efficiency of ~11% at the temperature difference of 430 K has been realized for the Zintl phase thermoelectric device comprised together with p-type Yb0.9Mg0.9Zn1.198Ag0.002Sb2. Additionally, the thermal aging and thermal cycle experiments proved the long-term reliability of the Mg2Ni/Mg3.15Co0.05SbBi0.99Se0.01 interface and the nano-silver sintering joints. Our work paves an effective avenue for the development of advanced devices for thermoelectric power generation.

Date: 2024
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DOI: 10.1038/s41467-024-45869-w

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