High-Performance Ag-Modified Bi0.5Sb1.5Te3 Films for the Flexible Thermoelectric Generator

材料科学 热电效应 热电发电机 塞贝克系数 热电材料 复合数 碲化铋 复合材料 光电子学 制作 纳米技术 热导率 热力学 物理 病理 替代医学 医学
作者
Hongjing Shang,Taiguang Li,Dan Luo,Luo Yu,Qi Zou,Daxing Huang,Liye Xiao,Hongwei Gu,Zhifeng Ren,Fazhu Ding
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:12 (6): 7358-7365 被引量:113
标识
DOI:10.1021/acsami.9b21771
摘要

Bi–Sb–Te-based semiconductors possess the best room-temperature thermoelectric performance, but are restricted for application in the wearable field because of their inherent brittleness, rigidity, and nonscalable manufacturing techniques. Therefore, how to obtain thermoelectric materials with excellent thermoelectric properties and flexibility through the batch production process is a serious challenge. Here, we report the fabrication of flexible p-type thermoelectric Ag-modified Bi0.5Sb1.5Te3 films on flexible substrates using a facile approach. Their optimized power factors are ∼12.4 and ∼14.0 μW cm–1 K–2 at 300 and 420 K, respectively. These high-power factors mainly originate from the optimized carrier transport of the composite system, through which a high level of electrical conductivity is achieved, whereas a remarkably improved Seebeck coefficient is simultaneously obtained. Bending tests demonstrate the excellent flexibility and mechanical durability of the composite films, and their power factors decrease by only about 10% after bending for 650 cycles with a bending radius of 5 mm. A flexible thermoelectric module is designed and constructed using the optimized composite films and displays a power density of ∼1.4 mW cm–2 at a relatively small ΔT of 60 K. This work demonstrates the potential of inorganic thermoelectric materials to be made on flexible/wearable substrates for energy harvesting and management devices.
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