不同维度Ag_(2)Se构筑柔性热电薄膜的性能优化与器件集成研究  

Flexible Thermoelectric Films with Different Ag_(2)Se Dimensions:Performance Optimization and Device Integration

作　　者：张哲 孙婷婷 王连军[1,2] 江莞 ZHANG Zhe;SUN Tingting;WANG Lianjun;JIANG Wan(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Glass Manufacturing Technology,Ministry of Education,Donghua University,Shanghai 201620,China;Institute of Functional Materials,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海201620 [2]东华大学先进玻璃制造技术教育部工程研究中心,上海201620 [3]东华大学功能材料研究中心,上海201620

出　　处：《无机材料学报》2024年第11期1221-1227,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(U23A20685);上海市教委科研创新项目(2021-01-07-00-03-E00110)。

摘　　要：Ag_(2)Se热电薄膜及器件因其窄带隙半导体特性在室温下显示出良好的热电性能,成为近年来可穿戴热电能源转换领域的研究热点。常见的Ag_(2)Se薄膜多由纳米颗粒堆积构筑而成,纳米材料维度对堆积网络的热电传输特性具有重要影响。本研究采用溶剂热法和模板法分别制备了不同维度的Ag_(2)Se纳米材料,通过喷涂工艺结合高温热处理,在聚酰亚胺基底上构筑了柔性Ag_(2)Se热电薄膜,系统研究了Ag_(2)Se纳米材料维度对薄膜微观结构和热电性能的影响。与一维纳米线结构相比,零维Ag_(2)Se纳米颗粒构筑的热电薄膜具有更优的导电网络和热电性能,薄膜的室温功率因子可达199.6μW·m^(-1)·K^(-2),而在375 K时功率因子为257.9μW·m^(-1)·K^(-2),表现出良好的热电性能。基于性能优异的Ag_(2)Se薄膜,进一步设计集成了具有四条热电臂的柔性热电器件。该器件具有良好的机械柔性和输出性能,以20 mm为弯曲半径,在弯曲循环1000次后,内阻仅增加了8.2%;在30 K的温差下,器件开路电压可达9.1 mV,最大输出功率达43.7 nW。本研究为制备柔性Ag_(2)Se热电薄膜材料与器件提供了新的思路和方向。Ag_(2)Se-based thermoelectric films and devices have become a popular research topic in the field of wearable thermoelectric energy conversion due to their narrow bandgap semiconductor properties,which exhibit good thermoelectric properties at room temperature.These films are typically constructed by stacking nanoparticles,and the dimensions of nanomaterials significantly impact the thermoelectric transport properties of the network.In this study,Ag_(2)Se nanomaterials with different dimensions were prepared by solvothermal and template methods,and flexible Ag_(2)Se thermoelectric films were constructed on polyimide substrates using Ag_(2)Se nanomaterials with different dimensions by spraying process combined with high-temperature post processing.The effects of the dimensionality of Ag_(2)Se nanomaterials on the microstructures and thermoelectric properties of the films were then systematically investigated.Zero dimensional Ag_(2)Se nanoparticles exhibited superior conductive networks and thermoelectric properties in comparison to one dimensional nanowire structures.Furthermore,the room temperature power factor of the films reached 199.6μW·m^(-1)·K^(-2),and the power factor was 257.9μW·m^(-1)·K^(-2)at the temperature of 375 K,which indicated the good thermoelectric properties of the films.Additionally a device was designed and integrated based on the Ag_(2)Se films,with four thermoelectric arms and excellent performance.The device exhibited good mechanical flexibility and output performance with internal resistance increased by only 8.2%after 1000 bending cycles(bending radius:20 mm),and the device displayed an open-circuit voltage of 9.1 mV and a max output power of 43.7 nW at a temperature difference of 30 K.This study presents a novel approach for the preparation of flexible Ag_(2)Se-based thermoelectric thin-film materials and devices.

关 键 词：Ag_(2)Se热电材料 材料维度 柔性热电薄膜 热电器件 

分 类 号：TQ174[化学工程—陶瓷工业]