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Optimization of thermoelectric performance in Sm-substituted SrSi2 via carrier transport and lattice engineering
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DOI：10.1080/14686996.2025.2551486.png)
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Abstract
En 中文
The pursuit of sustainable thermoelectric materials requires the development of cost-effective and efficient compounds derived from earth-abundant elements. Here, we investigate the effects of samarium (Sm) substitution on the thermoelectric performance of SrSi2 with compositions Sr1-xSmxSi2 (x = 0, 0.05, 0.1, 0.15, and 0.2). Substituting Sm for Sr in SrSi2 enhances the power factor at low substitution levels, while further substitution leads to a decrease, due to increased carrier scattering and reduced Seebeck coefficient. Introducing Sm substitution enhances phonon scattering through point defects, reducing lattice thermal conductivity. A peak figure of merit (ZT) of similar to 0.23 at room temperature is achieved for Sr-0.Sm-95(0).Si-05(2), demonstrating a 35% improvement over undoped SrSi2. The weighted mobility of similar to 285 cm(2)/V center dot s and the tailored thermal transport emphasize the role of Sm substitution in modulating both electronic and thermal properties. These findings establish Sr1-xSmxSi2 as a promising candidate for next-generation thermoelectric devices. [GRAPHICS]
Keywords:
Thermoelectric material
silicide
seebeck coefficient
electrical resistivity
thermal transport
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