Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites

Chang C, Ibáñez M. 2021. Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites. Materials. 14(18), 5416.

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Journal Article | Published | English

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Abstract
Thermoelectric materials enable the direct conversion between heat and electricity. SnTe is a promising candidate due to its high charge transport performance. Here, we prepared SnTe nanocomposites by employing an aqueous method to synthetize SnTe nanoparticles (NP), followed by a unique surface treatment prior NP consolidation. This synthetic approach allowed optimizing the charge and phonon transport synergistically. The novelty of this strategy was the use of a soluble PbS molecular complex prepared using a thiol-amine solvent mixture that upon blending is adsorbed on the SnTe NP surface. Upon consolidation with spark plasma sintering, SnTe-PbS nanocomposite is formed. The presence of PbS complexes significantly compensates for the Sn vacancy and increases the average grain size of the nanocomposite, thus improving the carrier mobility. Moreover, lattice thermal conductivity is also reduced by the Pb and S-induced mass and strain fluctuation. As a result, an enhanced ZT of ca. 0.8 is reached at 873 K. Our finding provides a novel strategy to conduct rational surface treatment on NP-based thermoelectrics.
Publishing Year
Date Published
2021-09-19
Journal Title
Materials
Acknowledgement
The authors thank the EMF facility in IST Austria for providing SEM and EDX measurements.
Acknowledged SSUs
Volume
14
Issue
18
Article Number
5416
eISSN
IST-REx-ID

Cite this

Chang C, Ibáñez M. Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites. Materials. 2021;14(18). doi:10.3390/ma14185416
Chang, C., & Ibáñez, M. (2021). Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites. Materials. MDPI. https://doi.org/10.3390/ma14185416
Chang, Cheng, and Maria Ibáñez. “Enhanced Thermoelectric Performance by Surface Engineering in Snte-Pbs Nanocomposites.” Materials. MDPI, 2021. https://doi.org/10.3390/ma14185416.
C. Chang and M. Ibáñez, “Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites,” Materials, vol. 14, no. 18. MDPI, 2021.
Chang C, Ibáñez M. 2021. Enhanced thermoelectric performance by surface engineering in snte-pbs nanocomposites. Materials. 14(18), 5416.
Chang, Cheng, and Maria Ibáñez. “Enhanced Thermoelectric Performance by Surface Engineering in Snte-Pbs Nanocomposites.” Materials, vol. 14, no. 18, 5416, MDPI, 2021, doi:10.3390/ma14185416.
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2021-10-14
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