Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through introducing a small amount of Zn
Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through introducing a small amount of Zn
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通过引入少量Zn协同优化n型PbSe相互依赖的热电参数
DOI：
10.1016/j.mtphys.2019.100102
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发表时间：
2019-06
影响因子：
11.5
通讯作者：
Zhao L D
中科院分区：
文献类型：
--
作者：
Qian X;Wu H;Wang D;Zhang Y;Pennycook S J;Gao X;Zheng L;Zhao L D
在这项工作中，我们发现，相互依赖的热电参数的n型PbSe可以协同优化，通过引入少量的Zn。PbZn0.01Se在523 K下获得了26.2μW cm−1K− 2的高功率因数，这归因于Zn的突出作用。我们发现小的Zn原子首先占据Pb空位，这不仅增加了载流子浓度，而且提高了载流子迁移率。当Zn的含量超过一定水平时，小Zn原子会形成晶体和纳米沉淀物，大大降低了晶格热导率，但对载流子的散射较小，从而保持了较高的载流子迁移率。功率因数的显著提高和晶格热导率的显著降低相结合有助于实现高热电性能。PbZn 0.01 Se在873 K时的最大ZT为1.5，平均ZT为0.84，上级目前已知的PbSe系。这项工作提供了一种策略，协同优化相互依赖的热电参数，通过引入小金属原子。
In this work, we found that the interdependent thermoelectric parameters ofn-type PbSe can be synergistically optimized through introducing a small amount of Zn. A record high power factor of 26.2μW cm−1K−2was achieved in PbZn0.01Se at 523 K, which is ascribed to the outstanding roles of Zn. We found that small Zn atoms first occupy Pb vacancies, which not only increases the carrier concentration but also improves the carrier mobility. When the content of Zn exceeds a certain level, the small Zn atoms will form interstitials and nanoprecipitates, which can enormously decrease the lattice thermal conductivity but slightly scatter carriers, thus maintaining a high carrier mobility. Combination of significantly enhanced power factor and remarkedly reduced lattice thermal conductivity contributes to a high thermoelectric performance. A maximumZT∼1.5 at 873 K and a high averageZT∼0.84 are achieved in PbZn0.01Se, which are superior to those of the most reportedn-type PbSe systems. This work provides a strategy to synergistically optimize interdependent thermoelectric parameters through introducing small metallic atoms.
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影响因子：
3.7
作者：
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通讯作者：
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DOI：
10.1073/pnas.1111419109
发表时间：
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