塞贝克系数
兴奋剂
热电效应
载流子
电子迁移率
化学
调制(音乐)
电阻率和电导率
异质结
热导率
光电子学
热电材料
分析化学(期刊)
材料科学
电气工程
复合材料
物理
热力学
工程类
色谱法
声学
作者
Yanling Pei,Haijun Wu,Di Wu,Fengshan Zheng,Jiaqing He
摘要
We report a greatly enhanced thermoelectric performance in a BiCuSeO system, realized by improving carrier mobility through modulation doping. The heterostructures of the modulation doped sample make charge carriers transport preferentially in the low carrier concentration area, which increases carrier mobility by a factor of 2 while maintaining the carrier concentration similar to that in the uniformly doped sample. The improved electrical conductivity and retained Seebeck coefficient synergistically lead to a broad, high power factor ranging from 5 to 10 μW cm(-1) K(-2). Coupling the extraordinarily high power factor with the extremely low thermal conductivity of ∼0.25 W m(-1) K(-1) at 923 K, a high ZT ≈ 1.4 is achieved in a BiCuSeO system.
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