Edge-released, piezoelectric MEMS acoustic transducers in array configuration

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Title:	Edge-released, piezoelectric MEMS acoustic transducers in array configuration
Authors:	陳世叡;Chen, Shih-Jui;Choe, Youngki;Baumgartel, Lukas;Lin, Anderson;Kim, Eun Sok
Contributors:	工學院機械工程學系
Keywords:	Acoustics;Applied sciences;Arrays;Bandwidth;Diaphragms;Electronics;Exact sciences and technology;General equipment and techniques;Instruments, apparatus, components and techniques common to several branches of physics and astronomy;Mechanical engineering. Machine design;Mechanical instruments, equipment and techniques;Microelectromechanical systems;Microelectronic fabrication (materials and surfaces technology);Micromechanical devices and systems;Physics;Piezoelectricity;Precision engineering, watch making;Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices;Stresses;Transducers;Zinc oxide
Date:	2012-02-01
Issue Date:	2026-04-23 15:00:45 (UTC+8)
Publisher:	IOP Publishing Ltd.;Bristol: IOP Publishing
Abstract:	摘要： A sensitive, broad-bandwidth piezoelectric microelectromechanic al systems (MEMS) transducer based on frequency interleaving of resonant transducers was designed and fabricated. A sputter-deposited piezoelectric zinc oxide (ZnO) thin film on the diaphragm is used to sense and generate acoustic pressure. A high compliance cantilever and spiral-beam-supported diaphragms are designed and built on the edge-released MEMS structure to release initial residual stress and to avoid in-plane tension when bent. Stress compensation has been achieved by adjusting the thickness of each layer of the cantilever and by compensating for the ZnO film's compressive stress with the bimorph structure of the spiral-beam. For a given pressure level and diaphragm size, the maximum strain on the spiral-beam-supported diaphragm is about an order of magnitude larger than that of a rectangular cantilever diaphragm. Also, the acoustic transducer built on the spiral-beam-supported diaphragm has a much higher sensitivity (but with less tolerance on the fabrication process variation and at the cost of lower usable bandwidth) than the one built on a rectangular cantilever diaphragm. By connecting many transducers in parallel, both the sensitivity and acoustic output were improved about 30 times. The interleaving of the transducers increased not only the sensitivity, but also broadened the useable bandwidth. 出版者： Bristol: IOP Publishing 出版日期： 2012-02-01 出處： Journal of micromechanics and microengineering, 2012-02, Vol.22 (2), p.025005-9 資源來源： Institute of Physics Journals 版權： 2015 INIST-CNRS 識別號： ISSN: 0960-1317 識別號： EISSN: 1361-6439 識別號： DOI: 10.1088/0960-1317/22/2/025005
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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