Simultaneous Optimization of Electrical and Thermal Transport Properties of BiSbSe1.50Te1.50 Thermoelectrics by Hot Deformation

doi:10.15541/jim20240190

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J Inorg Mat ›› 0 DOI: 10.15541/jim20240190

Simultaneous Optimization of Electrical and Thermal Transport Properties of BiSbSe_1.50Te_1.50 Thermoelectrics by Hot Deformation

TIAN Zhen¹, JIANG Quanwei¹, LI Jianbo¹, YU Lifeng¹, KANG Huijun^1,2, WANG Tongmin^1,2

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Abstract

As a typical multi-layered compound thermoelectric material, BiSbSe_1.50Te_1.50, can be utilized to fabricate p-n junctions with the same chemical composition. It has great potential in the development and design of high-performance TE devices due to its ability to avoid lattice mismatch incompatibility and harmful band misalignment. However, the TE performance of n-type BiSbSe_1.50Te_1.50 is limited due to the poor electrical transport properties, which hinders its further application in TE devices. Therefore, it is of great significance to improve the thermoelectric (TE) performance by enhancing the electrical transport properties while maintaining low thermal conductivity. In this work, a series of n-type BiSbSe_1.50Te_1.50hot deformation samples were prepared by solid-state reaction combined with hot pressed (HP) sintering. It is found that the preferred orientation and nanoscale lamellar structures with large surface areas form in hot-deformed samples. The donor-like effect elevates the carrier concentration, while these lamellar structures facilitate higher carrier mobility by providing expressways for carriers, giving rise to the enhanced electrical conductivity. Additionally, various and abundant multiscale defects are introduced into samples, evoking strong phonon scattering with different frequency and thus lowering the thermal conductivity. The electrical and thermal transport properties have been synergistically optimized by hot deformation, realizing the improvement of TE properties for n-type BiSbSe_1.50Te_1.50. As a result, a peak ZT of 0.50 at 500 K is achieved for the hot-deformed sample, increased almost ~138% compared to the undeformed sample (0.29). This work establishes a foundation for further advancement of the preparation for BiSbSe_1.50Te_1.50 TE devices with high conversion efficiency and homogeneous structure.

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n-type BiSbSe_1.50Te_1.50 / thermoelectric material / hot deformation / synergistical optimization

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TIAN Zhen, JIANG Quanwei, LI Jianbo, YU Lifeng, KANG Huijun, WANG Tongmin. Simultaneous Optimization of Electrical and Thermal Transport Properties of BiSbSe_1.50Te_1.50 Thermoelectrics by Hot Deformation[J]. Journal of Inorganic Materials. 0 https://doi.org/10.15541/jim20240190

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Funding

National Natural Science Foundation of China (52271025, 51927801, U22A20174); Science and Technology Planning Project of Liaoning Province(2023JH2/101700295); Innovation Foundation of Science and the Technology of Dalian (No. 2023JJ12GX021).