Boosting carrier mobility in MgAgSb via in-situ InSb nanoprecipitates for high-efficiency segmented thermoelectric module

Liangjun Xie, Haoyang Tong, Guyang Peng, Hao Wu, Wenjing Shi, Kuai Yu, Jinsuo Hu, Lei Jiao, Xingyan Dong, Fengkai Guo, Wei Cai, Yang Zhang, Haijun Wu (), Zihang Liu () and Jiehe Sui ()
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Liangjun Xie: Harbin Institute of Technology
Haoyang Tong: Harbin Institute of Technology
Guyang Peng: Xi’an Jiaotong University
Hao Wu: Harbin Institute of Technology
Wenjing Shi: Harbin Institute of Technology
Kuai Yu: Harbin Institute of Technology
Jinsuo Hu: Harbin Institute of Technology
Lei Jiao: Harbin Institute of Technology
Xingyan Dong: Harbin Institute of Technology
Fengkai Guo: Harbin Institute of Technology
Wei Cai: Harbin Institute of Technology
Yang Zhang: Xi’an Jiaotong University
Haijun Wu: Xi’an Jiaotong University
Zihang Liu: Harbin Institute of Technology
Jiehe Sui: Harbin Institute of Technology

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Carrier mobility has conventionally been manipulated to enhance thermoelectric performance by reducing crystal defects. Therefore, an effective strategy for optimizing carrier mobility is highly desired for nanostructured materials. In this work, InSb nanoprecipitates are formed in situ within the nanostructured MgAgSb matrix, serving as channels for accelerating charge carriers. A high carrier mobility of 93.1 cm2 V-1 s-1 is achieved in MgAg0.97Sb0.99-0.02InSb composite at 300 K, resulting in an average power factor of 23.8 μW cm-1 K-2 from 300 K to 553 K. To address the efficiency degradation caused by the narrow operational temperature range of MgAgSb, a two-pair segmented thermoelectric module is developed. A high conversion efficiency of 12.4% is achieved under a cold-side temperature of ~293 K and a temperature difference of ~540 K, presenting an effective strategy for carrier mobility optimization and opening new avenues for medium-temperature waste heat harvesting using MgAgSb.

Date: 2025
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DOI: 10.1038/s41467-025-62902-8

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