热电效应
材料科学
化学计量学
热电材料
热导率
分析化学(期刊)
凝聚态物理
热力学
化学
物理化学
复合材料
色谱法
物理
作者
Yuyou Zhang,Kaikai Pang,Qiang Zhang,Yanan Li,Wenjie Zhou,Xiaojian Tan,Jacques Noudem,Gang Wu,Lidong Chen,Haoyang Hu,Peng Sun,Jiu Hui Wu,Guoqiang Liu,Jun Jiang
标识
DOI:10.1002/smtd.202301256
摘要
Power generation modules utilizing thermoelectric (TE) materials are suitable for recycling widespread low-grade waste heat (<600 K), highlighting the immediate necessity for advanced Bi2 Te3 -based alloys. Herein, the substantial enhancement in TE performance of the p-type Bi0.4 Sb1.6 Te3 (BST) sintered sample is realized by subtly incorporating the non-stoichiometric Ag5 Te3 and counteractive Se. Specifically, Ag atoms diffused into the BST lattice improve the density-of-states effective mass (md* ) and boost the hole concentration for the suppressed bipolar effect. The addition of Se further improves md* prompting the room-temperature power factor upgrade to 46 W cm-1 K-2 . Concurrently, the lattice thermal conductivity is considerably lowered by multiple scattering sources exemplified by Sb-rich nanoprecipitates and dense dislocations. These synergistic results yield a high peak ZT of 1.44 at 375 K and an average ZT of 1.28 between 300 and 500 K in the Bi0.4 Sb1.6 Te2.95 Se0.05 + 0.05 wt.% Ag5 Te3 sample. More significantly, when coupled with n-type zone-melted Bi2 Te2.7 Se0.3 , the integrated 17-pair TE module achieves a competitive conversion efficiency of 6.1% and an output power density of 0.40 W cm-2 at a temperature difference of 200 K, demonstrating great potential for practical applications.
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