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Synergistically Optimized Thermoelectric and Mechanical Properties in p ‐Type BiSbTe by a Microdroplet Deposition Technique
Author(s) -
Hu Haoyang,
Tan Xiaojian,
Guo Zhe,
Wang Hongxiang,
Zhou Zhilong,
Xiong Chenglong,
Li Zhixiang,
Liu Guoqiang,
Noudem Jacques G.,
Jiang Jun
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202001024
Subject(s) - materials science , thermoelectric effect , bismuth telluride , deposition (geology) , vickers hardness test , stacking , grain size , composite material , alloy , thermoelectric materials , metallurgy , thermal conductivity , microstructure , paleontology , physics , nuclear magnetic resonance , sediment , biology , thermodynamics
Bismuth telluride is widely used in thermoelectric cooling, but the commercial zone‐melting materials suffer the poor mechanical property and dramatically decrease thermoelectric performance at intermediate temperature. Herein, a low‐cost and high‐efficiency preparation technique named microdroplet deposition is demonstrated to synergistically improve the thermoelectric and mechanical properties of Bi 0.48 Sb 1.52 Te 3 alloy. It is found that a weakly preferred alignment with fine grains occurs during the molten droplets flattening and stacking processes. Although the obtained power factor is not further improved, the corresponding κ l is significantly suppressed due to the increased interfacial thermal resistance between flakes by the micropores and dense grain boundaries. Consequently, a peak ZT of 1.12 and a Vickers hardness of 0.60 GPa are simultaneously achieved in the microdroplet‐deposited sample.