Improving an electret transducer by fully utilizing the implanted charge

Hiroshi Okamoto, Teppei Onuki, Hiroki Kuwano

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Most of the countercharge in the conventional electret-based electromechanical transducer, where the electret is formed on a conducting or semiconducting substrate, is induced in the substrate. Here we introduce a type of electret transducer that contains a freestanding electret without a conducting substrate, thereby enhancing the electric field between the electret and the electrodes where the output current is generated. A measurement of the power output from an electromechanical transducer yielded approximately five times larger power when a freestanding electret film was used than when the same electret material was deposited on a conducting substrate.

Original languageEnglish
Article number122901
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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