热电效应
材料科学
热电材料
塞贝克系数
熵(时间箭头)
热导率
维氏硬度试验
电子迁移率
凝聚态物理
热力学
带隙
价带
工程物理
光电子学
纳米技术
复合材料
微观结构
物理
工程类
作者
Qiang Zhang,Zhe Guo,Ruoyu Wang,Xiaojian Tan,Kun Song,Peng Sun,Haoyang Hu,Chen Cui,Guoqiang Liu,Jun Jiang
标识
DOI:10.1002/adfm.202205458
摘要
Abstract The emerged strategy of entropy engineering provides new ideas for realizing high‐performance thermoelectric materials, but it is still much unresolved how to achieve delicate trade‐off between the carrier mobility m H and the lattice thermal conductivity κ ph in taking advantage of configurational entropy Δ S . Herein, the significant advances of ultralow κ ph yet decent m H in a new medium‐entropy system of well‐designed (Pb, Ge, Sb, Cd) co‐alloyed SnTe is reported. Moreover, the co‐alloying also optimizes the carrier concentration n H and promotes the valence band convergence, thereby yielding an excellent Seebeck coefficient and compensating for decreased electrical conductivity. Consequently, a high peak ZT of 1.5 at 800 K, a record average ZT of 0.84 (300−800 K), and a remarkable Vickers hardness of 134 H V are concurrently attained in Cd 0.02 (Sn 0.59 Pb 0.15 Ge 0.2 Sb 0.06 ) 0.98 Te. Benefiting from the synergistically increased ZT and mechanical strength, the fabricated 17‐couple SnTe‐based thermoelectric module exhibits a competitive conversion efficiency of 6.3% at Δ T = 350 °C. This study not only provides a paradigm of the medium‐entropy design for thermoelectric materials but also puts forward an innovative scheme for low‐grade heat harvest by SnTe‐based TE module.
科研通智能强力驱动
Strongly Powered by AbleSci AI