Manipulating Band Convergence and Resonant State in Thermoelectric Material SnTe by Mn-In Codoping
Manipulating Band Convergence and Resonant State in Thermoelectric Material SnTe by Mn-In Codoping
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通过 Mn-In 共掺杂控制热电材料 SnTe 的能带会聚和谐振态
DOI：
10.1021/acsenergylett.7b00285
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发表时间：
2017
影响因子：
22
通讯作者：
Jiang Jun
中科院分区：
文献类型：
--
作者：
Wang Ling;Tan Xiaojian;Liu Guoqiang;Xu Jingtao;Shao Hezhu;Yu Bo;Jiang Haochuan;Yue Song;Jiang Jun
我们报告了通过操纵Mn-In共掺杂SnTe的能带工程来增强热电性能。结果表明，SnTe是实现带收敛和共振态协同作用的独特例子。根据能带理论，能带收敛有利于重掺杂，而共振态有利于轻掺杂。根据这一思路，通过热压法制备了一系列Mn-In共掺杂SnTe样品。在Sn0.915Mn0.11In0.005Te中，Seebeck系数在300 K时显著提高，达到116 μV K - 1。通过仔细调整固溶体的能带结构，我们在823 K时获得了1.15的高ztmax和0.62的整体增强ztave。当tc = 300 K和th = 850 K时，大温度范围内热电性能的改善导致了10.1%的竞争性转换效率，这表明Mn-In共掺杂SnTe是中温热电应用的有希望的候选材料。
We report an enhanced thermoelectric performance by manipulating band engineering in Mn–In codoped SnTe. It has been revealed that SnTe is a unique example achieving the synergy of band convergence and resonant state. According to band theory, band convergence favors heavy doping, while resonant state favors light doping. Following this idea, a series of Mn–In codoped SnTe samples are prepared by hot pressing. A significantly enhanced Seebeck coefficient of 116 μV K–1at 300 K is observed in Sn0.915Mn0.11In0.005Te. By carefully tuning the band structure of the solid solution, we achieve a high ZTmaxof 1.15 at 823 K and an overall enhanced ZTaveof 0.62. The improved thermoelectric performance in a large temperature range leads to a competitive conversion efficiency of 10.1% withTc= 300 K andTh= 850 K, suggesting Mn–In codoped SnTe is a promising candidate for medium-temperature thermoelectric applications.