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Ultrahigh thermoelectric properties of p-type bixSb2-xte3 thin films with exceptional flexibility for wearable energy harvesting

引用

CARBON ENERGY 2024年第8期6卷 273-284页

作者： Zheng, Zhuang-Hao Zhong, Yi-Ming Li, Yi-Liu Nisar, Mohammad Mansoor, Adil Li, Fu Chen, Shuo Liang, Guang-Xing Fan, Ping Xu, Dongyan Wei, Meng Chen, Yue-Xing Shenzhen Univ Coll Phys & Optoelect Engn Shenzhen Key Lab Adv Thin Films & Applicat Key Lab Optoelect Devices & Syst Minist Educ & Gua Shenzhen Peoples R China Shenzhen Univ Coll Phys & Optoelect Engn Shenzhen Key Lab Adv Thin Films & Applicat Key Lab Optoelect Devices & Syst Minist Educ & Gua Shenzhen 518060 Peoples R China Chinese Univ Hong Kong Dept Mech & Automat Engn Sha Tin Hong Kong Peoples R China

Use of a flexible thermoelectric source is a feasible approach to realizing self-powered wearable electronics and the Internet of Things. Inorganic thin films are promising candidates for fabricating flexible power supply, but obtaining high-thermoelectric-performance thin films remains a big challenge. In the present work, a p-type bixSb2-xte3 thin film is designed with a high figure of merit of 1.11 at 393 K and exceptional flexibility (less than 5% increase in resistance after 1000 cycles of bending at a radius of similar to 5 mm). The favorable comprehensive performance of the bixSb2-xte3 flexible thin film is due to its excellent crystallinity, optimized carrier concentration, and low elastic modulus, which have been verified by experiments and theoretical calculations. Further, a flexible device is fabricated using the prepared p-type bixSb2-xte3 and n-type Ag2Se thin films. Consequently, an outstanding power density of similar to 1028 mu W cm(-2) is achieved at a temperature difference of 25 K. This work extends a novel concept to the fabrication of high-performance flexible thin films and devices for wearable energy harvesting.

关键词： bixSb2-xte3 electrical transport properties flexibility thermoelectric THERMAL-CONDUCTIVITY bi2te3 films PERFORMANCE SB2te3 FIGURE MERIT ENHANCEMENT FABRICATION TRANSITION COMPOSIte

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