To achieve high‐performance n‐type PbTe‐based thermoelectric materials, this work provides a synergetic strategy to improve electrical transport property with indium (In) element doping and reduces thermal conductivity with sulfur (S) element alloying. In n‐type PbTe, In doping can tune the carrier density in the whole working temperature range, causing the carrier density to increase from 2.18 × 10¹⁹ cm⁻³ at 300 K to 4.84 × 10¹⁹ cm⁻³ at 823 K in Pb_0.98In_0.005Sb_0.015Te. The optimized carrier density can further modulate electrical conductivity and Seebeck coefficient, finally contributing to a substantial increase of power factor, and a maximum power factor increase from 19.7 µW cm⁻¹ K⁻² in Pb_0.985Sb_0.015Te to 28.2 µW cm⁻¹ K⁻² in Pb_0.9775In_0.0075Sb_0.015Te. Based on the optimally In‐doped PbTe, S alloying is introduced to suppress phonon propagation by forming a complete solid solution, which could effectively reduce lattice thermal conductivity and simultaneously benefit carrier mobility to maintain high power factor. With S alloying, the minimum lattice thermal conductivity decreases from 0.76 Wm⁻¹ K⁻¹ in Pb_0.985Sb_0.015Te to 0.42 Wm⁻¹ K⁻¹ in Pb_0.98In_0.005Sb_0.015Te_0.88S_0.12. Combining the advantages of both In doping and S alloying, the peak ZT value and averaged ZT (ZT_ave) (300–873 K) are boosted from 1.0 and 0.60 in Pb_0.985Sb_0.015Te to 1.4 and 0.87 in Pb_0.98In_0.005Sb_0.015Te_0.94S_0.06.

中文翻译：

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铟掺杂和硫合金化协同增强n型PbTe的热电性能

为了获得高性能的基于n型PbTe的热电材料，这项工作提供了一种协同策略，以掺杂铟（In）元素来改善电传输性能，并通过硫（S）元素合金化来降低导热性。在n型PbTe中，In掺杂可在整个工作温度范围内调整载流子密度，从而使载流子密度从300 K时的2.18×10 ¹⁹ cm ^-3增加到823 K in Pb中的4.84×10 ¹⁹ cm ^-3 _0.98在_0.005的Sb _0.015特。优化的载流子密度可以进一步调节电导率和塞贝克系数，最终有助于功率因数的显着增加，最大功率因数从Pb _0.985 Sb _0.015 Te中的19.7 µW cm ^-1  K ^-2增加到28.2 µW cm ^-1  K ^-2 in铅_0.9775 In _0.0075 Sb _0.015特。基于最佳的In掺杂PbTe，S合金化被引入以通过形成完整的固溶体来抑制声子传播，这可以有效地降低晶格热导率，同时有利于载流子迁移率以保持高功率因数。通过S合金化，最小晶格热导率从Pb _0.985 Sb _0.015 Te中的0.76 Wm ^-1  K ^-1降至Pb _0.98 In _0.005 Sb _0.015 Te _0.88 S _0.12中的0.42 Wm ^-1 K ^-1。结合In掺杂和S合金的优点，ZT峰值和平均值ZT（ZT _ave）（300–873 K）从Pb _0.985 Sb _0.015 Te中的1.0和0.60提高到Pb _0.98 In _0.005 Sb _0.015 Te _0.94 S _0.06中的1.4和0.87 。