Abstract Among the intermediate temperature (500–900 K) thermoelectric materials, both the p- and n-type lead telluride (PbTe) compounds have attracted extensive interests. Till date various approaches were adopted to enhance the thermoelectric performance of n-type PbTe-based materials as they show greater potential space for further improvement compared to p-type ones. Herein, a pseudo-ternary n-type (PbTe)0.95-x(Sb2Se3)x(PbS)0.05 system was designed and a large value of ZT = 1.61 at 850 K in case of x = 0.01 was achieved. Two factors are responsible for the improved thermoelectric performance. The incorporation of lead sulfide is the key factor to maintain a high level of power factor above 700 K and the multi-scale hierarchical architectures yield ultra-low thermal conductivity.

中文翻译：

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通过多尺度声子散射具有超低热导率的伪三元 (PbTe)0.95-x(Sb2Se3)x(PbS)0.05 系统的热电性能

摘要 在中温 (500–900 K) 热电材料中，p 型和 n 型碲化铅 (PbTe) 化合物引起了广泛的兴趣。迄今为止，人们采用了各种方法来提高 n 型 PbTe 基材料的热电性能，因为与 p 型材料相比，它们显示出更大的进一步改进潜力。在此，设计了伪三元 n 型 (PbTe)0.95-x(Sb2Se3)x(PbS)0.05 系统，在 x = 0.01 的情况下，在 850 K 下实现了 ZT = 1.61 的大值。有两个因素导致热电性能的提高。硫化铅的掺入是保持高于 700 K 的高功率因数水平的关键因素，并且多尺度分层结构产生超低热导率。