Authors
Bo Yan, Jiaxiang Wang, Yi Chen, Yahui Li, Xiangxiang Gao, Zhiyuan Hu, Xiaowen Zhou, Mengqiu Li, Zhuoqing Yang, Congchun Zhang
Published in
Microsystems & nanoengineering. Volume 11. Issue 1. Pages 73. Apr 28, 2025. Epub Apr 28, 2025.
Abstract
Micro thermoelectric device (μ-TED) emerges with great attention in energy generation, thermal management, and heat sensing applications. However, the large sensitive area is necessary to accommodate enough thermoelectric couples (TCs) for a high thermoelectric performance. This limits the potential in micro energy harvesting and ultra-sensitive sensing applications. Here, we adopted an optimized MEMS-based process to fabricate the ultra-sensitive micro-thermoelectric device (μ-TED). With the help of MEMS-compatible electrochemical deposition, the small size (25 μm), high aspect ratio (1:1.25), and alternating distributed P/N structures are achieved. As a result, the μ-TED realizes an ultra-high integration density of 19,900 thermoelectric couples per cm2. Moreover, it shows a great thermoelectric sensitivity of 212 mV/(K·cm2) and a competitive power factor of 0.51 μW/(K2·cm2), which means the μ-TED is competent for miniaturized applications. Additionally, the μ-TED shows an ultra-low detection limit of 5 mm/s and a short response time of 100 ms, revealing great potential in fast detections of the ultra-low airflow. Furthermore, the ultra-sensitive μ-TED is utilized as a flexible breath sensor, due to its compact size. The breath signal of different motion states is successfully detected. These results confirm that the ultra-sensitive μ-TED holds outstanding potential for ultra-sensitive airflow sensing and energy harvesting devices.
PMID:
40289182
Bibliographic data and abstract were imported from PubMed on 28 Apr 2025.
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