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• W4223962015 abstract "Mg3Sb2-based Zintl compounds have been paid much attention in recent years because of their high peak figure of merit (zT), however, there is room for the improvement of the average zT. In this work, the thermoelectric performance of Mg3(Sb,Bi)2 single crystal by using density functional theory is investigated. The optimal carrier concentration (n) of Mg3SbBi is 2 × 1019 to 3 × 1020 cm–3 at 100−700 K. At the n of 3 × 1019 cm–3, it can exhibit a high average zT of ≈1.27 at cold-side temperature (Tc) of 300 K and hot-side temperature (Th) of 700 K, and the electrical transport performance can be further improved by increasing the n. When the optimal n is reached, the maximum average zT of Mg3SbBi at Tc of 100 K and Th of 300 K can be up to 0.54, which is comparable to that of state-of-the-art Bi2(Te,Se)3. Because the decreasing trend of the optimal n with temperature, the maximum low-temperature thermoelectric performance is easier to be achieved by less extrinsic doping. This work reveals the great potential of Mg3(Sb,Bi)2 single crystal for thermoelectric cooling or power generation, which is expected to provide useful guidance for thermoelectric devices." @default.
• W4223962015 created "2022-04-19" @default.
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• W4223962015 date "2022-04-15" @default.
• W4223962015 modified "2023-09-27" @default.
• W4223962015 title "Theoretical Study on Thermoelectric Performance of N‐Type Mg ₃ (Sb,Bi) ₂ Single Crystal for Cooling or Power Generation" @default.
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• W4223962015 doi "https://doi.org/10.1002/adts.202200049" @default.
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