塞贝克系数
材料科学
三元运算
热电效应
热电材料
热导率
扩散
带隙
凝聚态物理
各向异性
电阻率和电导率
电子能带结构
热力学
光电子学
复合材料
物理
光学
电气工程
计算机科学
程序设计语言
工程类
作者
Xin Qian,Hehui Jin,Xuefei Li,Bangfu Ding,Jiang-Long Wang,Shufang Wang
摘要
The layered ternary PbBi2Te4 is regarded as a promising thermoelectric material due to its intricate crystal structure. However, current research on PbBi2Te4 primarily focuses on theoretical calculations and predictions, with limited investigations conducted on its actual thermoelectric transport properties. In this study, we synthesized the single-phase PbBi2Te4 compound using the high-temperature melting method. The research findings indicate that PbBi2Te4 exhibits significant anisotropic thermoelectric properties and a pronounced bipolar diffusion effect, which can be attributed to its unique layered crystal structure and relatively narrow bandgap. This bipolar diffusion effect remarkably exacerbates the Seebeck coefficient of PbBi2Te4 and amplifies its thermal conductivity. To address these challenges, we effectively manipulated the electronic band structure of PbBi2Te4 and enlarged the bandgap through the incorporation of Se alloying. The thermoelectric performance of PbBi2Te4 has been significantly enhanced as a result of the increase in Seebeck coefficient and reduction in thermal conductivity. Ultimately, a superior ZT value of ∼0.52 at 673 K is achieved in PbBi2(Te0.85Se0.15)4, representing an impressive improvement of ∼ 49% compared to the pure PbBi2Te4. These results demonstrate the promising potential of ternary PbBi2Te4 as a thermoelectric material.
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