Piezoelectric ZnO Thin Films for 2DOF MEMS Vibrational Energy Harvesting

Tao, Kai, Yi, Haiping, Tang, Lihua, Wu, Jin, Wang, Peihong, Wang, Nan, Hu, Liangxing, Fu, Yong Qing, Miao, Jianmin and Chang, Honglong (2019) Piezoelectric ZnO Thin Films for 2DOF MEMS Vibrational Energy Harvesting. Surface and Coatings Technology, 359. pp. 289-295. ISSN 0257-8972

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Official URL: https://doi.org/10.1016/j.surfcoat.2018.11.102

Abstract

Zinc oxide (ZnO) is an environmental-friendly semiconducting, piezoelectric and non-ferroelectric material, and plays an essential role for applications in microelectromechanical systems (MEMS). In this work, a fully integrated two-degree-of-freedom (2DOF) MEMS piezoelectric vibration energy harvester (p-VEH) was designed and fabricated using ZnO thin films for converting kinetic energy into electrical energy. The 2DOF energy harvesting system comprises two subsystems: the primary one for energy conversion and the auxiliary one for frequency adjustment. Piezoelectric ZnO thin film was deposited using a radio-frequency magnetron sputtering method onto the primary subsystem for energy conversion from mechanical vibration to electricity. Dynamic performance of the 2DOF resonant system was analyzed and optimized using a lumped parameter model. Two closely located but separated peaks were achieved by precisely adjusting mass ratio and frequency ratio of the resonant systems. The 2DOF MEMS p-VEH chip was fabricated through a combination of laminated surface micromachining process, double-side alignment and bulk micromachining process. When the fabricated prototype was subjected to an excitation acceleration of 0.5 g, two close resonant peaks at 403.8 and 489.9 Hz with comparable voltages of 10 and 15 mV were obtained, respectively.

Item Type: Article
Uncontrolled Keywords: ZnO thin films, Vibrational energy harvesting, 2DOF, Piezoelectric, MEMS
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 19 Dec 2018 09:34
Last Modified: 07 Jan 2019 16:15
URI: http://nrl.northumbria.ac.uk/id/eprint/37338

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