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Integrating Band Structure Engineering with All-Scale Hierarchical Structuring for High Thermoelectric Performance in PbTe System

机译：结合带结构工程与全尺度分层结构，实现PbTe系统中的高热电性能

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摘要

PbTe1-xSex-2%Na-y%SrTe system is investigated and a high maximum ZT of 2.3 at 923 K for PbTe0.85Se0.15-2%Na-4%SrTe is reported. This is achieved by performing electronic band structures modifications as well as all-scale hierarchical structuring and combining the two effects. It is found that high ZTs in PbTe0.85Se0.15-2%Na-4%SrTe are possible at all temperature from 300 to 873 K with an average ZT(ave) of 1.23. The high performance in PbTe1-xSex-2%Na-y%SrTe can be achieved by either choosing PbTe-2Na-4SrTe or PbTe0.85Se0.15-2Na as a matrix. At room temperature the carrier mobility shows negligible variations as SrTe fraction is increased, however the lattice thermal conductivity is significantly reduced from approximate to 1.1 to approximate to 0.82 W m(-1) K-1 when 5.0% SrTe is added, correspondingly, the lattice thermal conductivity at 923 K decreases from approximate to 0.59 to approximate to 0.43 W m-(1) K-1. The power factor maxima of PbTe1-xSex-2Na-4SrTe shift systematically to higher temperature with rising Se fractions due to bands divergence. The maximum power factors reach approximate to 27, approximate to 30, approximate to 31 W cm(-1) K-2 for the x = 0, 0.05, and 0.15 samples peak at 473, 573, and 623 K, respectively. The results indicate that ZT can be increased by synergistic integration of band structure engineering and all-scale hierarchical architectures.
机译：研究了PbTe1-xSex-2％Na-y％SrTe系统，并报道了923 K下PbTe0.85Se0.15-2％Na-4％SrTe的最大最大ZT为2.3。这是通过执行电子能带结构修改以及所有级别的分层结构并将两种效果组合在一起来实现的。发现在300至873 K的所有温度下，PbTe0.85Se0.15-2％Na-4％SrTe中的高ZT都是可能的，平均ZT（ave）为1.23。通过选择PbTe-2Na-4SrTe或PbTe0.85Se0.15-2Na作为基质，可以实现PbTe1-xSex-2％Na-y％SrTe的高性能。在室温下，随着SrTe分数的增加，载流子迁移率变化可忽略不计，但是当添加5.0％SrTe时，晶格热导率从大约1.1显着降低到大约0.82 W m（-1）K-1。 923 K时的晶格热导率从大约0.59降低到大约0.43 W m-（1）K-1。由于谱带发散，PbTe1-xSex-2Na-4SrTe的功率因数最大值随着Se分数的增加而系统地转移到更高的温度。对于x = 0、0.05和0.15样品，最大功率因数分别达到473、573和623 K的峰值，大约达到27，大约30，大约31 W cm（-1）K-2。结果表明，带结构工程与全尺度分层体系的协同集成可以提高ZT。

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  • 来源
    《Advanced energy materials》 |2017年第3期|1601450.1-1601450.11|共11页
  • 作者

    Pei Yanling; Tan Gangjian; Feng Dan; Zheng Lei; Tan Qing; Xie Xiaobing; Gong Shengkai; Chen Yue; Li Jing-Feng; He Jiaqing; Kanatzidis Mercouri G.; Zhao Li-Dong;

  • 作者单位

    Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China|South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China;

    Northwestern Univ, Dept Chem, Evanston, IL 60208 USA;

    Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

    Tsinghua Univ, Sch Mat Sci & Engn, Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China;

    South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China|Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

    Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China;

    Tsinghua Univ, Sch Mat Sci & Engn, Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China;

    South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China|Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China;

    Northwestern Univ, Dept Chem, Evanston, IL 60208 USA;

    Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    all-scale hierarchical structuring; band structure engineering; PbTe; thermoelectric;

    机译：全尺度分层结构;带结构工程;PbTe;热电;

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