材料科学
热电效应
热压
兴奋剂
纹理(宇宙学)
空位缺陷
打滑(空气动力学)
变形(气象学)
复合材料
分析化学(期刊)
光电子学
结晶学
热力学
化学
物理
图像(数学)
色谱法
人工智能
计算机科学
作者
Jing Zhou,Jianghe Feng,Hao Li,Duo Liu,Guojuan Qiu,Feng Qiu,Juan Li,Zhong‐Zhen Luo,Zhigang Zou,Rong Sun,Ruiheng Liu
出处
期刊:Small
[Wiley]
日期:2023-03-14
卷期号:19 (24)
被引量:15
标识
DOI:10.1002/smll.202300654
摘要
The carrier concentration in n-type layered Bi2 Te3 -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 Bi2 Te2.7 Se0.3 + 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 Bi2 Te2.7 Se0.3 + 0.05 wt.% SbI3 and commercial p-type Bi0.5 Sb1.5 Te3 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 Bi2 Te3 , thereby promoting its applications in harsh conditions.
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