通过共振散射和晶格软化的协同作用实现 p 型 PbTe 的高热电性能,ACS Applied Materials & Interfaces

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通过共振散射和晶格软化的协同作用实现 p 型 PbTe 的高热电性能
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsami.1c14236
Taras Parashchuk ₁ , Bartlomiej Wiendlocha ₂ , Oleksandr Cherniushok ₁ , Rafal Knura _{1,

3} , Krzysztof T Wojciechowski ₁

Affiliation

在这项工作中，我们展示了与 Tl 和 Na 共掺杂的p型 PbTe中电传输的同时增强和声子传播的减少。先进电子结构工程的有效利用在300 到 825 K 的温度范围内提高了热电功率因数S ² σ。由于来自 Tl 共振态的增强的有效质量m *，获得了塞贝克系数S 的上升在 PbTe。由于钠共掺杂带来的额外载流子的存在，电导率显着提高。此外，Tl 和 Na 杂质诱导晶格软化，显着降低晶格热导率，这通过测量的低声速得到证实v _m和高内部应变Cε _XRD。最终，调谐电子结构和晶格软化效应的结合导致Pb _1–_x_–_y Tl _x Na _y Te 样品的ZT值高达 ~2.1 。由于平均热电品质因数ZT _ave的显着提高，估算的能量转换效率显示了 15.4% 的非凡值（T _c = 300 K，T _h = 825 K）= 1.05。这项工作表明，杂质共振散射和晶格软化的结合可以成为推进热电学的突破性概念。

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High Thermoelectric Performance of p-Type PbTe Enabled by the Synergy of Resonance Scattering and Lattice Softening

In this work, we show the simultaneous enhancement of electrical transport and reduction of phonon propagation in p-type PbTe codoped with Tl and Na. The effective use of advanced electronic structure engineering improves the thermoelectric power factor S²σ over the temperature range from 300 to 825 K. A rise in the Seebeck coefficient S was obtained due to the enhanced effective mass m*, coming from the Tl resonance state in PbTe. Due to the presence of additional carriers brought by Na codoping, electrical conductivity became significantly improved. Furthermore, Tl and Na impurities induced crystal lattice softening, remarkably reducing lattice thermal conductivity, which was confirmed by a measured low speed of sound v_m and high internal strain Cε_XRD. Eventually, the combination of both the attuned electronic structure and the lattice softening effects led to a very high ZT value of up to ∼2.1 for the Pb_1–x–yTl_xNa_yTe samples. The estimated energy conversion efficiency shows the extraordinary value of 15.4% (T_c = 300 K, T_h = 825 K), due to the significantly improved average thermoelectric figure of merit ZT_ave = 1.05. This work demonstrates that the combination of impurity resonance scattering and crystal lattice softening can be a breakthrough concept for advancing thermoelectrics.

更新日期：2021-10-20

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