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Energy Harvesting by Vibrations With MEMS Piezoelectric Benders

[+] Author Affiliations
Changki Mo, Ryan R. Knight, Amanda A. Frederick, William W. Clark

University of Pittsburgh, Pittsburgh, PA

Paper No. DETC2009-87309, pp. 489-494; 6 pages
doi:10.1115/DETC2009-87309
From:
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME

abstract

Piezoelectric micro benders are fabricated and tested to demonstrate energy generating performance. Trapezoidal and diagonal unimorph PZT benders with an interdigitated electrode pattern are utilized. The d33 mode design is beneficial for the micro energy harvesting devices because it can generate higher voltage than that of the d31 mode design. It can also eliminate a bottom electrode by only using an interdigitated top electrode which facilitates fabrication, as opposed to the d31 mode design that requires both top and bottom electrodes. The MEMS benders consist of layers of SiO2 /SiNx /ZrO2 /PZT, and a top Au/Cr interdigitated electrode. The experimental results indicate that the fundamental frequencies of the micro benders are about 9.1 kHz for the trapezoidal bender and 18.48 kHz for the diagonal bender, respectively. The micro trapezoidal bender can generate power of approximately 1.4μW into a 680 kΩ resistive load at the resonant frequency. The diagonal bender can generate power of about 18.2 μW into a 100 kΩ resistive load at the resonant frequency.

Copyright © 2009 by ASME

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