碘掺杂和多尺度结构设计提高n型碲化铅的热电性能

doi:10.16553/j.cnki.issn1000-985x.2025.0104

摘要/Abstract

摘要： 相比较p型碲化铅，n型PbTe热电性能较差，阻碍了其在中温热电应用领域的发展。本研究通过水热法合成了碘掺杂纳米级PbTe_1-xI_x 粉体，并结合退火和放电等离子体烧结（SPS）技术制备了多尺度结构的n型PbTe_1-xI_x，实现了电子-声子解耦，优化了电性能和热性能。碘掺杂所形成的固溶体在保证载流子高迁移率的同时，提高了载流子浓度，使n型PbTe_1-xI_x 具有较高的功率因子；同时，多尺度结构对声子的散射使材料拥有较低的晶格热导率。因此，n型PbTe_1-xI_x 的ZT值得到了大幅度提升，在650 K时ZT值达到了1.29。

关键词: n型碲化铅; 水热法; 碘掺杂; 多尺度结构; 热电性能

Abstract: The lower thermoelectric performance of n-type PbTe has hindered the development of mid-temperature thermoelectric applications compared to p-type lead telluride. In this study， nanometer-scale iodine doping PbTe_1-xI_x powder was synthesized through hydrothermal method， and a multi-scale structure of n-type PbTe_1-xI_x was prepared by combining annealing and spark plasma sintering （SPS） techniques， achieving electron-phonon decoupling to optimize electrical and thermal performance. The solid solution formed by iodine doping increase carrier concentration while ensuring high carrier mobility， resulting in a high power factor for n-type PbTe_1-xI_x. Meanwhile， the multi-scale structure facilitates phonon scattering， leading to a lower lattice thermal conductivity. Consequently， the ZT value of n-type PbTe_1-xI_x was significantly enhanced， reaching a ZT value of 1.29 at 650 K.

Key words: n-type lead telluride; hydrothermal method; iodine doping; multi-scale structure; thermoelectric performance

中图分类号:

TQ134.3⁺3

陈继虎, 路亚妮, 聂兮. 碘掺杂和多尺度结构设计提高n型碲化铅的热电性能[J]. 人工晶体学报, 2025, 54(11): 1947-1953.

CHEN Jihu, LU Yani, NIE Xi. Improving the Thermoelectric Performance of n-Type Lead Telluride Through Iodine Doping and Multi-Scale Structural Design[J]. Journal of Synthetic Crystals, 2025, 54(11): 1947-1953.

图/表 5

图1 PbTe1-xIx 的XRD图谱（x=0，0.005，0.010，0.015）

Fig.1 XRD patterns of PbTe1-xIx （x=0， 0.005， 0.010， 0.015）

图2 PbTe0.99I0.01的SEM照片

Fig.2 SEM images of PbTe0.99I0.01

图3 PbTe1-xIx 的电传输性能与温度的关系（x=0，0.005，0.010，0.015）

Fig.3 Temperature dependence of electronic performance for PbTe1-xIx （x=0， 0.005， 0.010， 0.015）

图4 PbTe1-xIx 的热传输性能与温度的关系（x=0，0.005，0.010，0.015）

Fig.4 Temperature dependence of thermal performance for PbTe1-xIx （x=0， 0.005， 0.010， 0.015）

图5 PbTe1-xIx 的热电性能与温度的关系（x=0，0.005，0.010，0.015）

Fig.5 Temperature dependence of thermalelectric performance for PbTe1-xIx （x=0， 0.005， 0.010， 0.015）

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