The advantages and potential of electret-based vibration-driven micro energy harvesters

Hiroshi Okamoto, Takafumi Suzuki, Kazuhiro Mori, Ziping Cao, Teppei Onuki, Hiroki Kuwano

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


In this paper, we clarify the use and potential of the electret, in the context of vibration-driven micro-energy harvesting that seeks to obtain energy from a vibrating environment to power small electronic devices. An electret is an insulator containing a permanent electric charge or dipole. We make broad comparisons against other methods such as electromagnetic methods and methods using piezoelectric materials, in order to identify the advantages and disadvantages of the electrets. In particular, we introduce a new general model that covers both the electrets and piezoelectric materials to enable comparisons on a common basis. This is followed by a review of a recent method, developed by our group to make full use of the implanted charge inside an electret. Furthermore, we investigate other ways to realize the full potential of the electret as a key material for electromechanical energy conversion in applications where only small forces are involved.

Original languageEnglish
Pages (from-to)1180-1190
Number of pages11
JournalInternational Journal of Energy Research
Issue number13
Publication statusPublished - 2009
Externally publishedYes


  • Electret
  • Electromechanical power conversion
  • Energy harvesting
  • Piezoelectric material
  • Vibration

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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