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- W3110166422 abstract "SnTe is an attracted lead-free thermoelectric material, but the thermoelectric performance is severely limited by the high hole concentration, undesirable valence band structure and high thermal conductivity. In this work, we study the multiple effects of MnBi codoping in SnTe to synergistically improve the overall power factor and ZT values. It is found that the MnBi codoping effectively reduces the hole concentration to an optimal range. As expected, Mn and Bi doping obviously decreases the energy separation between the two valence band maxima, enabling pronounced band convergence and improved Seebeck coefficient. Moreover, MnBi codoping introduces various phonon scattering centers to scatter a wide spectrum of phonons for a suppressed lattice thermal conductivity of 0.67 W m−1 K−1 at 850 K. The synergy of these effects yields a peak ZT of 1.3 at 850 K and an average ZT of 0.68 (300–850 K) in Sn0.90Mn0.07Bi0.03Te, suggesting SnTe-based material a promising candidate for medium-temperature thermoelectric applications." @default.
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- W3110166422 date "2021-10-01" @default.
- W3110166422 modified "2023-09-30" @default.
- W3110166422 title "Improvement of thermoelectric properties of SnTe by Mn Bi codoping" @default.
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- W3110166422 doi "https://doi.org/10.1016/j.cej.2020.127795" @default.
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