Thermoelectric properties of Eu- and Na-substituted SnTe

Wang, Xinke; Guo, Kai; Veremchuk, Igor; Burkhardt, Ulrich; Feng, Xunda; Grin, Juri; Zhao, Jing‐Tai

doi:10.1016/s1002-0721(14)60543-3

Cited by 14 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…View Article Online DOI: 10.1039/D1MA00155H 96% higher than the value 0.28 at 775 K of pristine SnTe and as this value is higher than the reported value of other lanthanides (Sn 0.94 Gd 0.06 Te and Sn 49.25 Te 49.25 Eu 1.5 ) 40,42. …”

mentioning

confidence: 54%

See 1 more Smart Citation

A synergistic approach to achieving the high thermoelectric performance of La-doped SnTe using resonance state and partial band convergence

et al. 2021

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 54%

“…39 Moreover, this is the highest power factor value achieved compared to other reported values for lanthanides. 40 , -Σ =…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

A synergistic approach to achieving the high thermoelectric performance of La-doped SnTe using resonance state and partial band convergence

et al. 2021

View full text Add to dashboard Cite

show abstract

“…SnTe has been regarded as the lead-free alternative of PbTe, owing to their similar crystal and band structures. − Compared with PbTe, undoped SnTe exhibits a much higher carrier concentration originating in the intrinsic Sn vacancies, which leads to smaller Seebeck coefficient and higher thermal conductivity. − Many efforts have been made to reduce the carrier concentration. − Alternatively, band engineering is found to be an efficient way to improve the Seebeck coefficient for SnTe. − Band convergence and resonant level have been achieved by introducing various dopants, such as Mn, − Mg, Ca, Cd, , Hg, In, , and some co-dopants. − By combining band convergence and phonon scattering, Pei et al improved the TE performance to ZT = 1.6 …”

Section: Introductionmentioning

confidence: 99%

Ultralow Lattice Thermal Conductivity in SnTe by Manipulating the Electron–Phonon Coupling

et al. 2019

View full text Add to dashboard Cite

SnTe has been regarded as an environment-friendly alternative of PbTe thermoelectrics, although its performance is limited by its high thermal conductivity, partly owing to its high carrier concentration. In SnTe + xAgSbSe2, we observe a significant decrease of the total thermal conductivity from 3.37 to 1.27 W m–1 K–1 at 850 K, even though the hole concentration is at a high level of 1021 cm–3. With the increase of the AgSbSe2 fraction, both the electrical and thermal conductivities decrease to their minima at x = 20%, and then they start to increase simultaneously, indicating strong electron–phonon coupling. By applying the first-principles calculations, it is unraveled that the minimum of thermal conductivity is due to the nonmonotonic dependence of electron–phonon coupling on the lattice constant. At x = 20%, a ZT value of 0.95 at 850 K is achieved, accompanied by an ultralow lattice thermal conductivity. This study reveals that tuning the electron–phonon coupling could be an efficient way to improve the thermoelectric performance, if it is constrained within the process of intravalley scattering.

show abstract

“…Na-doping is also optimized in the SnTe material system by replacing Na with Sn, which increases Sn vacancies and enhances carrier concentration. For the improvement of TE properties, it was reported that the SnTe sample composition should be kept on the tin-rich side of the monotelluride phase . Thus, increasing the amount of Sn up to the solubility limit in the SnTe matrix can reduce the carrier concentration .…”

Section: Introductionmentioning

confidence: 99%

Achieving High Thermoelectric Performance of Eco-Friendly SnTe-Based Materials by Selective Alloying and Defect Modulation

Abbas

Nisar

Zheng

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Recently, rock-salt lead-free chalcogenide SnTe-based thermoelectric (TE) materials have been considered an alternative to PbTe because of the nontoxic properties of Sn as compared to Pb. However, high carrier concentration that originated from intrinsic Sn vacancies and relatively high thermal conductivity of pristine SnTe lead to poor TE efficiency, which makes room for improving its TE properties. In this study, we present that the Na incorporation into the SnTe matrix is helpful for modifying the electronic band structure, optimization of carrier concentration, introducing dislocations, and kink planes; benefiting from these synergistic effects obviates the disadvantages of SnTe and makes a significant improvement in TE performance. We reveal that Na favorably impacts the structure of electronic bands by valence, conduction band engineering, leading to a nice enhancement in the Seebeck coefficient, which exhibits the highest power factor value of 37.93 μWcm −1 K −2 at 898 K, representing the best result for the SnTe material system. Moreover, a broader phonon spectrum is introduced by new phonon-scattering centers, scattered by dislocations and kink planes which suppressed lattice thermal conductivity to 0.57 Wm −1 K −1 at 898 K, which is much lower than that of pristine SnTe. Ultimately, a maximum ZT of 1.26 at 898 K is achieved in the Sn 1.03 Te + 3% Na sample, which is 97% higher than that of the pristine SnTe, suggesting that SnTe-based materials are a robust candidate for TE applications specifically, an ideal alternative of lead chalcogenides for TE power generation at high temperatures.

show abstract

Thermoelectric properties of Eu- and Na-substituted SnTe

Cited by 14 publications

References 23 publications

A synergistic approach to achieving the high thermoelectric performance of La-doped SnTe using resonance state and partial band convergence

A synergistic approach to achieving the high thermoelectric performance of La-doped SnTe using resonance state and partial band convergence

Ultralow Lattice Thermal Conductivity in SnTe by Manipulating the Electron–Phonon Coupling

Achieving High Thermoelectric Performance of Eco-Friendly SnTe-Based Materials by Selective Alloying and Defect Modulation

Contact Info

Product

Resources

About