Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation

Su L, Hong T, Wang D, Wang S, Qin B, Zhang M, Gao X, Chang C, Zhao LD. 2021. Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation. Materials Today Physics. 20, 100452.

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Journal Article | Epub ahead of print | English

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Author
Su, Lizhong; Hong, Tao; Wang, Dongyang; Wang, Sining; Qin, Bingchao; Zhang, Mengmeng; Gao, Xiang; Chang, ChengIST Austria; Zhao, Li Dong
Department
Abstract
SnSe, a wide-bandgap semiconductor, has attracted significant attention from the thermoelectric (TE) community due to its outstanding TE performance deriving from the ultralow thermal conductivity and advantageous electronic structures. Here, we promoted the TE performance of n-type SnSe polycrystals through bandgap engineering and vacancy compensation. We found that PbTe can significantly reduce the wide bandgap of SnSe to reduce the impurity transition energy, largely enhancing the carrier concentration. Also, PbTe-induced crystal symmetry promotion increases the carrier mobility, preserving large Seebeck coefficient. Consequently, a maximum ZT of ∼1.4 at 793 K is obtained in Br doped SnSe–13%PbTe. Furthermore, we found that extra Sn in n-type SnSe can compensate for the intrinsic Sn vacancies and form electron donor-like metallic Sn nanophases. The Sn nanophases near the grain boundary could also reduce the intergrain energy barrier which largely enhances the carrier mobility. As a result, a maximum ZT value of ∼1.7 at 793 K and an average ZT (ZTave) of ∼0.58 in 300–793 K are achieved in Br doped Sn1.08Se–13%PbTe. Our findings provide a novel strategy to promote the TE performance in wide-bandgap semiconductors.
Publishing Year
Date Published
2021-06-03
Journal Title
Materials Today Physics
Acknowledgement
This work was supported by National Natural Science Foundation of China (51772012), National Key Research and Development Program of China (2018YFA0702100 and 2018YFB0703600), the Beijing Natural Science Foundation (JQ18004). This work was also supported by Lise Meitner Project (M2889-N) and the National Postdoctoral Program for Innovative Talents (BX20200028). L.D.Z. appreciates the support of the High Performance Computing (HPC) resources at Beihang University, the National Science Fund for Distinguished Young Scholars (51925101), and center for High Pressure Science and Technology Advanced Research (HPSTAR) for SEM measurements.
Volume
20
Article Number
100452
eISSN
IST-REx-ID

Cite this

Su L, Hong T, Wang D, et al. Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation. Materials Today Physics. 2021;20. doi:10.1016/j.mtphys.2021.100452
Su, L., Hong, T., Wang, D., Wang, S., Qin, B., Zhang, M., … Zhao, L. D. (2021). Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation. Materials Today Physics. Elsevier. https://doi.org/10.1016/j.mtphys.2021.100452
Su, Lizhong, Tao Hong, Dongyang Wang, Sining Wang, Bingchao Qin, Mengmeng Zhang, Xiang Gao, Cheng Chang, and Li Dong Zhao. “Realizing High Doping Efficiency and Thermoelectric Performance in N-Type SnSe Polycrystals via Bandgap Engineering and Vacancy Compensation.” Materials Today Physics. Elsevier, 2021. https://doi.org/10.1016/j.mtphys.2021.100452.
L. Su et al., “Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation,” Materials Today Physics, vol. 20. Elsevier, 2021.
Su L, Hong T, Wang D, Wang S, Qin B, Zhang M, Gao X, Chang C, Zhao LD. 2021. Realizing high doping efficiency and thermoelectric performance in n-type SnSe polycrystals via bandgap engineering and vacancy compensation. Materials Today Physics. 20, 100452.
Su, Lizhong, et al. “Realizing High Doping Efficiency and Thermoelectric Performance in N-Type SnSe Polycrystals via Bandgap Engineering and Vacancy Compensation.” Materials Today Physics, vol. 20, 100452, Elsevier, 2021, doi:10.1016/j.mtphys.2021.100452.

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