MgSiSn/Mg2Sn amorphous–crystalline nanocomposites with enhanced figure-of-merit performance for efficient thermoelectric conversion

Masahiro Goto; Michiko Sasaki

doi:10.1016/j.jpcs.2025.113143

ジャーナル論文 MgSiSn/Mg2Sn amorphous–crystalline nanocomposites with enhanced figure-of-merit performance for efficient thermoelectric conversion

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Masahiro Goto, Michiko Sasaki. MgSiSn/Mg2Sn amorphous–crystalline nanocomposites with enhanced figure-of-merit performance for efficient thermoelectric conversion. Journal of Physics and Chemistry of Solids. 2025, 208 (), 113143. https://doi.org/10.1016/j.jpcs.2025.113143

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(abstract)

Thermoelectric conversion is emerging as an efficient method for transforming waste heat into electricity.
Approximately 60 % of unrecovered waste heat is below 500 K, necessitating suitable materials. Bi2Te3-based compounds, widely commercialized for this purpose, exhibit a figure of merit (zT) of one near room temperature but are expensive and highly toxic. While less toxic and more abundant materials including Mg2Sn and Mg2Si are explored as alternatives, their zT values remain considerably low. For zT enhancement, Mg2SixSny nanocomposite thin films were fabricated using a combinatorial sputter coating system. Through interfacial engineering and nanocrystallization, this system produced multilayered (ML) Mg2Si and Sn structures that overcame the trade-off relationship among Seebeck coefficient, electrical conductivity, and thermal conductivity, achieving zT values of 0.021 and 0.083 at room temperature and 520 K, respectively. ML samples were fabricated on flexible substrates for potential wearable thermoelectric applications. This zT-enhancement strategy can yield high-performance, ecofriendly thermoelectric thin films.

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