Qingtang Zhang , Pan Ying , Aftab Farrukh , Yaru Gong , Jizi Liu , Xinqi Huang , Di Li , Meiyu Wang , Guang Chen , Guodong Tang
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引用次数: 0
摘要
GeTe 因其极具竞争力的性能和良好的机械特性,正在成为一种前景广阔的中温热电材料。利用强 Rashba 自旋分裂,可以显著提高 Bi 和 Sn 共掺 GeTe 在中低温下的塞贝克系数和功率因数。此外,研究还发现掺杂铋-锡-铜可降低相变温度,从而将立方相更好的电传输特性延伸至低温。因此,中低温下的电传输特性得到了全面提升。同时,内轴异质纳米结构能有效散射声子,并在影响声子传播方面发挥主导作用。通过加强拉什巴效应和内轴异质纳米结构,无铅 GeTe 基化合物的平均热导率(300-823 K)达到了创纪录的 1.6 和 2.1。GeTe 在余热回收和发电领域的广泛应用前景广阔。
High wide-temperature-range thermoelectric performance in GeTe through hetero-nanostructuring
GeTe is emerging as promising medium-temperature thermoelectric material due to its highly competitive performance and good mechanical properties. Strong Rashba spin splitting was harnessed to markedly improve the Seebeck coefficient and power factor of Bi and Sn codoped GeTe at low-medium temperature. Moreover, it is found that Bi-Sn-Cu doping reduces the phase-transition temperature to extend better electrical transport behavior of cubic phase to low temperature. As a result, the electrical transport properties in low-medium temperature were overall enhanced. In the meanwhile, endotaxial hetero-nanostructures efficiently scatter phonons and play a dominant role on affecting phonon propagation. The lattice thermal conductivity was reduced to 0.2 W m−1K−1 at 673 K. Drive by strengthening Rashba effect and endotaxial hetero-nanostructures, a record-high average ZT (300–823 K) of 1.6 and a high ZT of 2.1 were obtained in lead-free GeTe-based compounds. The vast increase of ZT promotes GeTe as a promising candidate for a wide range of applications in waste heat recovery and power generation.
期刊介绍:
Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.