Saglik, K., Tan, X. Y., Dong, J., Suwardi, A., Wang, X., Xu, J., Zhu, Q., Liu, H., Cao, J., & Yan, Q. (2024). Improved thermoelectric efficiency of SB2SI2TE6 through Yttrium-Induced nanocompositing. Physical Chemistry Chemical Physics. https://doi.org/10.1039/d4cp04219k
Abstract:
Sb2Si2Te6 is a promising 2D material for medium-temperature thermoelectric applications, with the thermoelectric figure of merit zT approaching 1 at 823 K. However, its widespread use has been limited by relatively low power factor values. In this study, we successfully enhanced the performance of Sb2Si2Te6 by introducing Yttrium nanocomposites. This modification fine-tuned the carrier concentration and electrical conductivity, and increased the power factor up to 946 μW K−1 at 570 K. Jonker plot analysis revealed that increased carrier concentration did not affect the intrinsic electronic properties. SEM and TEM analyses revealed that Y nano-compositing introduced secondary phases, reducing the lattice thermal conductivity to values close to simulated ones using the Debye–Callaway model. Sb1.98Y0.02Si2Te6 exhibited the highest zT of 1.49 at 773 K due to the ultralow lattice thermal conductivity of 0.29 W m−1 K−1 and a moderate power factor of 858 μW K−1 at the same temperature. The single parabolic band (SPB) model suggests that with further optimization of the Fermi level and additional reduction in lattice thermal conductivity, the zT value could potentially increase to 1.55. These results demonstrate the potential of Y nanocompositing for enhancing Sb2Si2Te6 as an efficient medium-temperature thermoelectric material.
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Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - e-ASIA project
Grant Reference no. : R22I1IR053
This research / project is supported by the National Research Foundation - Low-Carbon Energy Research Phase 2 Programme
Grant Reference no. : U2411D4011
This research / project is supported by the Ministry of Education (MOE) Academic Research Fund (AcRF) Tier 1(RG128/21 and RG78/23), and MOE Tier 2 (MOE-T2EP50223-0003). - Academic Research Fund (AcRF) Tier 1 and Tier 2
Grant Reference no. : RG128/21 and RG78/23, MOE-T2EP50223-0003