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Enhancing the Thermoelectric Power Factor of Mg2Si/MgO Composites by Ag and Bi Codoping

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A high carrier concentration and mobility reduce the electrical resistivity (ρ) and enhance the power factor (PF) of thermoelectric (TE) materials based on electrical transport optimization. In this study, Ag/Bi codoped (0%, 1%, 2%, and 3% (wt.%)) Mg2Si/MgO TE material was synthesized by ball milling and hot pressing. The crystal structure, morphology, composition, electrical properties, and TE properties of the Ag/Bi codoped Mg2Si/MgO samples were analyzed by x-ray diffraction, scanning electron microscopy, energy-dispersive x-ray spectroscopy, Hall effect measurements, and Seebeck coefficient/electric resistance measurements, respectively. The results confirmed the correlation between the Mg2Si and MgO structures and indicated that all the samples exhibited n-type thermoelectricity. The Ag/Bi (2 wt.%) co-added Mg2Si/MgO sample yielded a low ρ of 31 mΩ m, a high Seebeck coefficient (S) of –619 µV K−1, and a high PF of 12.4 µW m−1 K−2 at room temperature. The PF of this sample is higher than that of the undoped sample by one order of magnitude (1.3 µW m−1 K−2). Further, at 773 K, the Ag/Bi (2 wt.%) co-added Mg2Si/MgO sample exhibited the highest PF of 112 µW m−1 K−2.

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This work was financially supported by the Council of Thailand (NRCT) through the Program Management Unit for Human Resources & Institutional Development Research and Innovation (PMU-B) (B16F650001) and the Office of the Permanent Secretary, Ministry of Higher Education, Science, Research and Innovation, Thailand, through Research Grant for New Scholar (Grant No. RGNS 65-174).

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Correspondence to Athorn Vora-ud or Tosawat Seetawan.

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Singsoog, K., Vora-ud, A., Charoenphakdee, A. et al. Enhancing the Thermoelectric Power Factor of Mg2Si/MgO Composites by Ag and Bi Codoping. J. Electron. Mater. 52, 4768–4774 (2023).

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