Cu2−δSe is an eco-friendly thermoelectric candidate owing to Cu ions migration in its high-temperature beta phase, and meanwhile the liquid-like Cu ions deteriorate the stability and reliability of materials. Here, Pb2+ ion was introduced into the Cu1.98Se lattice to improve the thermoelectric properties and the stability. The Pb-doped Cu1.98−xPbxSe (x = 0–0.035) compounds prepared by a facile solvothermal synthesis and microwave sintering. The obtained results reveal that the power factor of the doped samples greatly improved up to 1454 μW m−1 K−2 at 800 K, which was about 22.5% higher than that of undoped Cu1.98Se. In addition, after 3 cycles of testing, the power factor of Cu1.98Se decreased by 57% at 800 K, and that of Cu1.965Pb0.015Se decreased by less than 30%.

中文翻译：

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Pb掺杂对Cu1.98Se电输运性能的影响

Cu2-δSe是一种环保的热电候选材料，因为Cu离子在其高温β相中迁移，同时液态Cu离子降低了材料的稳定性和可靠性。在这里，Pb2+ 离子被引入到 Cu1.98Se 晶格中以提高热电性能和稳定性。通过简便的溶剂热合成和微波烧结制备的 Pb 掺杂的 Cu1.98-xPbxSe (x = 0-0.035) 化合物。获得的结果表明，掺杂样品的功率因数在 800 K 时大大提高至 1454 μW m-1 K-2，比未掺杂的 Cu1.98Se 高约 22.5%。此外，经过3个循环测试，Cu1.98Se在800K时的功率因数下降了57%，Cu1.965Pb0.015Se的功率因数下降了不到30%。