Ductile Ag20S7Te3 with Excellent Shape‐Conformability and High Thermoelectric Performance
Ductile Ag20S7Te3 with Excellent Shape‐Conformability and High Thermoelectric Performance
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DOI：
10.1002/adma.202007681
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发表时间：
2021-02
影响因子：
29.4
通讯作者：
Shiqi Yang;Zhiqian Gao;P. Qiu;Jiasheng Liang;Tian‐Ran Wei;Tingting Deng;J. Xiao;Xun Shi;Lidong Chen
中科院分区：
文献类型：
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作者：
Shiqi Yang;Zhiqian Gao;P. Qiu;Jiasheng Liang;Tian‐Ran Wei;Tingting Deng;J. Xiao;Xun Shi;Lidong Chen
异形热电（TE）发生器（TEG）可以为海底石油管道安全监测系统中使用的传感器供电，但由于缺乏既具有良好形状适应能力又具有高TE性能的材料，其发展受到很大限制。本文报道了一种新型的具有高TE性能的无机材料Ag 20 S7 Te 3。在300-600 K，Ag 20 S7 Te 3以体心立方结构结晶，其中S和Te原子随机占据（0，0，1）位。由于（101 <$）[010]滑移系中的广义堆垛层错能较小，Ag 20 S7 Te 3表现出比Ag 2S更好的延展性，从而产生优异的形状一致性。在Ag 20 S7 Te 3中观察到的高载流子迁移率和低晶格热导率导致在600 K下的最大无量纲优值（zT）为0.80，这与最好的商业Bi 2 Te 3基合金相当。由10个Ag 20 S7 Te 3条组成的原型TEG在70 K的温差下显示出69.2 mV的开路电压和17.1 µW的最大功率输出。这项研究为异型TEG开辟了一条新的途径。
Hetero‐shaped thermoelectric (TE) generators (TEGs) can power the sensors used in safety monitoring systems of undersea oil pipelines, but their development is greatly limited by the lack of materials with both good shape‐conformable ability and high TE performance. In this work, a new ductile inorganic TE material, Ag20S7Te3, with high TE performance is reported. At 300–600 K, Ag20S7Te3 crystallizes in a body‐centered cubic structure, in which S and Te atoms randomly occupy the (0, 0, 1) site. Due to the smaller generalized stacking fault energy in the ( 101¯ )[010] slip system, Ag20S7Te3 shows better ductility than Ag2S, yielding excellent shape‐conformability. The high carrier mobility and low lattice thermal conductivity observed in Ag20S7Te3 result in a maximum dimensionless figure of merit (zT) of 0.80 at 600 K, which is comparable with the best commercial Bi2Te3‐based alloys. The prototype TEG consisting of 10 Ag20S7Te3 strips displays an open‐circuit voltage of 69.2 mV and a maximum power output of 17.1 µW under the temperature difference of 70 K. This study creates a new route toward hetero‐shaped TEG.