材料科学
热电效应
塞贝克系数
电阻率和电导率
热导率
热电材料
声子散射
兴奋剂
分析化学(期刊)
凝聚态物理
制作
声子
热力学
光电子学
复合材料
电气工程
化学
物理
色谱法
工程类
病理
替代医学
医学
作者
Sheik Md Kazi Nazrul‐Islam,Md Rezoanur Rahman,Al Jumlat Ahmed,Frank Fei Yun,David Cortie,Xiaolin Wang,Michael B. Cortie
标识
DOI:10.1002/aelm.202100802
摘要
Abstract High‐performance thermoelectric materials require simultaneous reduction of thermal conductivity and electrical resistivity, among other criteria. Here it is shown that the introduction of Na 2 CO 3 into the melt‐route fabrication process for the well‐known thermoelectric Cu 2 Se has a beneficial and surprisingly strong effect. There is a significant enhancement in electrical conductivity which density functional theory calculations suggest may be due to the effect of Na and O doping in the Cu 2 Se matrix. There is also a 34% reduction in thermal conductivity which is likely due to a high density of defects causing scattering of phonons. Overall, however, there is only relatively a small change in Seebeck coefficient. A higher power factor of 12.6 µW cm −1 K −2 is achieved versus 8.8 µW cm −1 K −2 for standard Cu 2 Se. A very high value of zT of 2.3 is obtained at 804 K versus 1.1 for standard Cu 2 Se.
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