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Applied Physics Letters / Volume 100 / Issue 7 / ENERGY CONVERSION AND STORAGE

Appl. Phys. Lett. 100, 073901 (2012); http://dx.doi.org/10.1063/1.3685701 (3 pages)

Charge redistribution in piezoelectric energy harvesters

Mark Stewart, Paul M. Weaver, and Markys Cain

National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom

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(Received 17 October 2011; accepted 21 January 2012; published online 15 February 2012)

Piezoelectric energy harvesting cantilevers provide a simple, compact low cost construction method for energy harvesting from vibrational sources. Beam theory predicts a linear distribution of strain along the length of the beam, but the conversion of this strain to electrical energy is dependent on the coverage of the beam with active material. In this paper, we demonstrate how re-distribution of charge within the piezoelectric leads to losses that can be as high as 25% of the potential generated power. Reducing the area coverage of the piezoelectric is shown to significantly improve cantilever power output, with the optimum coverage being 2/3.

© 2012 Crown

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KEYWORDS, PACS, and IPC

Keywords

energy harvesting, piezoelectric transducers

PACS

  • 84.60.-h

    Direct energy conversion and storage

  • 43.38.Fx

    Piezoelectric and ferroelectric transducers

  • 85.50.-n

    Dielectric, ferroelectric, and piezoelectric devices

International Patent Classification (IPC)

  • B06B1/06

    Operating with piezo-electric effect or with electrostriction

  • H01L27/20

    Including piezo-electric components; Including electrostrictive components; Including magnetostrictive components

  • H01L41/00

    Piezo-electric elements in general; Electrostrictive elements in general; Magnetostrictive elements in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof

  • H02N2/18

    Producing electrical output from mechanical input, e.g. generators

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3685701

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef Crown

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