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首页> 外文期刊>ACS applied materials & interfaces >Precise Regulation of Carrier Concentration in Thermoelectric BiSbTe Alloys via Magnetic Doping
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Precise Regulation of Carrier Concentration in Thermoelectric BiSbTe Alloys via Magnetic Doping

机译：通过磁掺杂的热电性BISBTE合金中载流子浓度的精确调节

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摘要

The Bi2Te3-based alloy is the best commercial thermoelectric material around room temperature, although it is extremely difficult to further improve its thermoelectric performance. In this work, we demonstrate that magnetic doping is an effective strategy to regulate the thermoelectric performance of p-type Bi0.5Sb1.5Te3. According to our experiments, it is much more difficult for ferromagnetic Fe/Co to enter the Bi0.5Sb1.5Te3 lattice in comparison with diamagnetic Pb, which can be understood by the "like dissolves like" rule. At the same doping content, Fe and Co provide much lower hole carriers than Pb due to their larger carrier thermal activation energies, indicating that Fe and Co as dopants are very applicable for the fine regulation of the carrier concentration. The Fe/Co-doped samples have higher Seebeck coefficients but less carrier mobilities than the Pb-doped sample since the doped magnetic atoms induce additional carrier scattering. Beyond the solid solubility limit, excess Fe/Co represents as the impurity, which can maintain a high carrier concentration due to the metal-semiconductor contact. Finally, the zT values of similar to 1.05 and 1.15 near room temperature have been achieved for the samples with 1.71 at. % Co and 1.80 at. % Fe, respectively.
机译：基于Bi2Te3的合金是室温下最好的商业热电材料，尽管极难进一步提高其热电性能。在这项工作中，我们证明磁掺杂是调节p型Bi0.5sb1.5te3的热电性能的有效策略。根据我们的实验，铁磁Fe / CO进入BI0.5SB1.5TE3格子比与抗磁页PB相比更困难，这可以通过“诸如溶解等”规则来理解。在相同的掺杂含量，Fe和Co由于其较大的载体热激活能而提供比Pb更低的孔载体，表明Fe和Co作为掺杂剂非常适用于载体浓度的微调。由于掺杂的磁性原子引起额外的载体散射，Fe / Co掺杂样品具有更高的塞贝克系数，但比Pb掺杂样品更少。除了固体溶解度极限之外，过量的Fe / Co表示为杂质，其由于金属半导体接触而可以保持高载体浓度。最后，对于具有1.71的样品，已经实现了与1.05和1.15附近的1.05和1.15的ZT值。 ％co和1.80。 ％Fe分别。

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