Enhanced thermoelectric performance of n-type Bi_(2)Te_(2.7)Se_(0.3) via a simple liquid-assisted shear exfoliation  

作　　者：Yifeng Wang Yilin Song Kaikai Song Lin Pan Changchun Chen Kunihito Koumoto Qingfeng Liu 

机构地区：[1]College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China [2]Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing Tech University,Nanjing 210009,China [3]Nagoya Industrial Science Research Institute,Nagoya 464-0819,Japan [4]Center of Nanotechnology,King Abdulaziz University,Jeddah 21589,Saudi Arabia [5]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China

出　　处：《Journal of Materials Science & Technology》2022年第22期251-258,共8页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51672127);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).

摘　　要：A liquid-assisted shear exfoliation (LASE) as a new powder metallurgy method coupled with spark plasmasintering (SPS) was applied for n-type Bi_(2)Te_(2.7)Se_(0.3) and the effects on microstructure and anisotropictransport properties were investigated. Results revealed an effective reduction of average grain size dueto LASE and a high texturing in the bulks. Moreover, along the in-plane direction, electrical conductivitywas increased noticeably due to an enhanced carrier concentration, leading to a significantly improvedpower factor of 25 μW cm^(–1) K^(–2) at 303 K. Meanwhile, the total thermal conductivity was reduced effectively owing to reduction both in lattice component due to enhanced phonon scattering with the grainsize reduction, and in the bipolar component inhibited by the increased carrier concentration. Ultimately,a peak thermoelectric figure of merit (ZT) value of 0.83 was obtained at 448 K along the in-plane direction, increased by 95% compared with the pristine one. These results demonstrate the LASE process as auseful assistant method for enhancing the TE performance of layered materials.

关 键 词：Bi_(2)Te_(2.7)Se^(0.3) Liquid-assisted shear exfoliation Textured microstructure Thermoelectric 

分 类 号：TB34[一般工业技术—材料科学与工程]