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Significantly (00l)-textured Ag2Se thin films with excellent thermoelectric performance for flexible power applications
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-14 , DOI: 10.1039/d2ta06356e Zhuang-Hao Zheng 1 , Yi-Liu Li 1 , Jun-Yu Niu 1 , Meng Wei 1 , Dong-Liang Zhang 1 , Yi-ming Zhong 1 , Mohammad Nisar 1 , Adeel Abbas 1 , Shuo Chen 1 , Fu Li 1 , Guang-Xing Liang 1 , Ping Fan 1 , Yue-Xing Chen 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-14 , DOI: 10.1039/d2ta06356e Zhuang-Hao Zheng 1 , Yi-Liu Li 1 , Jun-Yu Niu 1 , Meng Wei 1 , Dong-Liang Zhang 1 , Yi-ming Zhong 1 , Mohammad Nisar 1 , Adeel Abbas 1 , Shuo Chen 1 , Fu Li 1 , Guang-Xing Liang 1 , Ping Fan 1 , Yue-Xing Chen 1
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Flexible thermoelectric power generation is a competitive candidate for powering wearable electronic devices and chip-sensors for the internet-of-things. Nevertheless, the poor thermoelectric performance of n-type flexible thin films limits their application, demonstrating strong demand for improving its properties. In the present work, flexible n-type Ag2Se thin films with an excellent power factor of 21.6 μW cm−1 K−2 at 348 K and the high ZT value ∼0.6 at 348 ∼ 363 K are obtained via rational micro-structural manipulations. The self-assembled thin films which grew on heated organic flexible substrates have a pure Ag2Se phase and are well-crystallized, leading to ultra-high electrical conductivity. Highly (00l)-textured thin films are obtained when the Ag/Se ratio is closed to the ideal stoichiometry, which contributes to a higher Seebeck coefficient than that of the (013)-textured ones, according to the theoretical analysis. Meanwhile, slightly Ag-rich Ag2Se thin films have low lattice thermal conductivity, resulting in moderate total thermal conductivity. Consequently, a flexible generator module with eight pairs of p–n legs is fabricated by using present n-type Ag2Se and self-made p-type Sb2Te3 films. It displays a maximum power of ∼800 nW when applying a temperature difference of 50 K, and an output voltage of 9.8 mV is achieved from the conversion of the human body heat through wearable device testing. The bending test results show an increase of only 5% in device resistance along a rod with a radius higher than 7.0 mm after 1000 cycles, indicating its good flexibility. Therefore, the novel design concept demonstrated in this work can provide an effective way to achieve high thermoelectric performance in flexible thin films and devices.
中文翻译：
具有显着 (00l) 纹理的 Ag2Se 薄膜，具有出色的热电性能，适用于柔性电源应用
柔性热电发电是为物联网的可穿戴电子设备和芯片传感器供电的竞争候选者。然而，n型柔性薄膜较差的热电性能限制了它们的应用，显示出对改善其性能的强烈需求。在目前的工作中，通过合理的微结构获得了在 348 K 时具有 21.6 μW cm -1 K -2的优异功率因数和在 348 ∼ 363 K 时高达 ∼0.6的高ZT值的柔性 n 型 Ag 2 Se 薄膜。操纵。在加热的有机柔性基板上生长的自组装薄膜具有纯 Ag 2Se 相结晶良好，具有超高的导电性。根据理论分析，当 Ag/Se 比率接近理想化学计量时，可以获得高度 (00 l ) 纹理的薄膜，这有助于比 (013) 纹理的薄膜具有更高的塞贝克系数。同时，稍微富Ag 2 Se 薄膜的晶格热导率较低，导致总热导率适中。因此，使用现有的n型Ag 2 Se和自制的p型Sb 2 Te 3制造了具有8对p-n腿的柔性发电机模块。电影。在施加50 K的温差时，它的最大功率约为800 nW，通过可穿戴设备测试将人体热量转换为9.8 mV的输出电压。弯曲测试结果表明，在1000次循环后，沿半径高于7.0 mm的杆的器件电阻仅增加5%，表明其具有良好的柔韧性。因此，这项工作中展示的新颖设计理念可以为在柔性薄膜和器件中实现高热电性能提供有效途径。
更新日期：2022-09-14
中文翻译：
具有显着 (00l) 纹理的 Ag2Se 薄膜，具有出色的热电性能，适用于柔性电源应用
柔性热电发电是为物联网的可穿戴电子设备和芯片传感器供电的竞争候选者。然而，n型柔性薄膜较差的热电性能限制了它们的应用，显示出对改善其性能的强烈需求。在目前的工作中，通过合理的微结构获得了在 348 K 时具有 21.6 μW cm -1 K -2的优异功率因数和在 348 ∼ 363 K 时高达 ∼0.6的高ZT值的柔性 n 型 Ag 2 Se 薄膜。操纵。在加热的有机柔性基板上生长的自组装薄膜具有纯 Ag 2Se 相结晶良好，具有超高的导电性。根据理论分析，当 Ag/Se 比率接近理想化学计量时，可以获得高度 (00 l ) 纹理的薄膜，这有助于比 (013) 纹理的薄膜具有更高的塞贝克系数。同时，稍微富Ag 2 Se 薄膜的晶格热导率较低，导致总热导率适中。因此，使用现有的n型Ag 2 Se和自制的p型Sb 2 Te 3制造了具有8对p-n腿的柔性发电机模块。电影。在施加50 K的温差时，它的最大功率约为800 nW，通过可穿戴设备测试将人体热量转换为9.8 mV的输出电压。弯曲测试结果表明，在1000次循环后，沿半径高于7.0 mm的杆的器件电阻仅增加5%，表明其具有良好的柔韧性。因此，这项工作中展示的新颖设计理念可以为在柔性薄膜和器件中实现高热电性能提供有效途径。
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