DOI: 10.1002/adfm.201602652. Understanding of the Extremely Low Thermal Conductivity in High‐Performance Polycrystalline SnSe through Potassium Doping

Understanding of the Extremely Low Thermal Conductivity in High‐Performance Polycrystalline SnSe through Potassium Doping

10.1002/adfm.201602652

Crossref journal-article

Wiley

Advanced Functional Materials (311)

Abstract

P‐type polycrystalline SnSe and K0.01Sn0.99Se are prepared by combining mechanical alloying (MA) and spark plasma sintering (SPS). The highest ZT of ≈0.65 is obtained at 773 K for undoped SnSe by optimizing the MA time. To enhance the electrical transport properties of SnSe, K is selected as an effective dopant. It is found that the maximal power factor can be enhanced significantly from ≈280 μW m−1 K−2 for undoped SnSe to ≈350 μW m−1 K−2 for K‐doped SnSe. It is also observed that the thermal conductivity of polycrystalline SnSe can be enhanced if the SnSe powders are slightly oxidized. Surprisingly, after K doping, the absence of Sn oxides at grain boundaries and the presence of coherent nanoprecipitates in the SnSe matrix contribute to an impressively low lattice thermal conductivity of ≈0.20 W m−1 K−1 at 773 K along the sample section perpendicular to pressing direction of SPS. This extremely low lattice thermal conductivity coupled with the enhanced power factor results in a record high ZT of ≈1.1 at 773 K along this direction in polycrystalline SnSe.

Bibliography

Chen, Y., Ge, Z., Yin, M., Feng, D., Huang, X., Zhao, W., & He, J. (2016). Understanding of the Extremely Low Thermal Conductivity in HighâPerformance Polycrystalline SnSe through Potassium Doping. Advanced Functional Materials, 26(37), 6836â6845. Portico.

Authors 7

Yue‐Xing Chen (first)
Zhen‐Hua Ge (additional)
Meijie Yin (additional)
Dan Feng (additional)
Xue‐Qin Huang (additional)
Wenyu Zhao (additional)
Jiaqing He (additional)

References 54 Referenced 227

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{'key': 'e_1_2_6_53_1', 'first-page': '11', 'volume-title': 'Thermoelectrics and Its Energy Harvesting', 'author': 'May A. F.', 'year': '2012'} / Thermoelectrics and Its Energy Harvesting by May A. F. (2012)
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Dates

Type	When
Created	9 years ago (Aug. 8, 2016, 3 p.m.)
Deposited	1 year, 11 months ago (Sept. 9, 2023, 11:27 a.m.)
Indexed	3 weeks, 3 days ago (July 28, 2025, 5:45 p.m.)
Issued	9 years ago (Aug. 8, 2016)
Published	9 years ago (Aug. 8, 2016)
Published Online	9 years ago (Aug. 8, 2016)
Published Print	8 years, 10 months ago (Oct. 1, 2016)

Funders 0

None

BibTeX

@article{Chen_2016, title={Understanding of the Extremely Low Thermal Conductivity in High‐Performance Polycrystalline SnSe through Potassium Doping}, volume={26}, ISSN={1616-3028}, url={http://dx.doi.org/10.1002/adfm.201602652}, DOI={10.1002/adfm.201602652}, number={37}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Chen, Yue‐Xing and Ge, Zhen‐Hua and Yin, Meijie and Feng, Dan and Huang, Xue‐Qin and Zhao, Wenyu and He, Jiaqing}, year={2016}, month=aug, pages={6836–6845} }

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