Affiliation:
1. Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China
2. Key Laboratory of Eco‐materials Advanced Technology College of Materials Science and Engineering Fuzhou University Fuzhou 350108 P. R. China
3. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
Abstract
AbstractThe carrier concentration in n‐type layered Bi2Te3‐based thermoelectric (TE) material is significantly impacted by the donor‐like effect, which would be further intensified by the nonbasal slip during grain refinement of crushing, milling, and deformation, inducing a big challenge to improve its TE performance and mechanical property simultaneously. In this work, high‐energy refinement and hot‐pressing are used to stabilize the carrier concentration due to the facilitated recovery of cation and anion vacancies. Based on this, combined with SbI3 doping and hot deformation, the optimized carrier concentration and high texture degree are simultaneously realized. As a result, a peak figure of merit (zT) of 1.14 at 323 K for Bi2Te2.7Se0.3 + 0.05 wt.% SbI3 sample with the high bending strength of 100 Mpa is obtained. Furthermore, a 31‐couple thermoelectric cooling device consisted of n‐type Bi2Te2.7Se0.3 + 0.05 wt.% SbI3 and commercial p‐type Bi0.5Sb1.5Te3 legs is fabricated, which generates the large maximum temperature difference (ΔTmax) of 85 K at a hot‐side temperature of 343 K. Thus, the discovery of recovery effect in high energy refinement and hot‐pressing has significant implications for improving TE performance and mechanical strength of n‐type Bi2Te3, thereby promoting its applications in harsh conditions.
Funder
Youth Innovation Promotion Association of the Chinese Academy of Sciences
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献