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Proceedings Paper

A blended polymer electret-based micro-electronic power generator
Author(s): Wen-Ching Ko; Bor-Shiun Lee; Jia-Lun Chen; Shun-Chi Lin; Wen-Jong Wu; Chih-Kung Lee
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Paper Abstract

Recently, power harvesting technologies for low-power electronic devices have attracted much interest. In this paper, the design and fabrication methods of a micro-electrostatic power generator is presented. This power generator comprises a stator developed using an electret film for charge storage and a rotor covered by an interdigital electrode for electric power generation. The newly developed electret material is made from mixing two solutions. The first solution was made by blending polystyrene (PS) and cycloolefin copolymer (COC). The second solution was obtained by an additive process as polar molecule was added into COC. This unique two solution electret method can easily be integrated and adopted to the micro fabrication process. The charge storage capability of this new electret material was investigated and results showed that low concentration of polystyrene in the blended material will not only have more stable but also higher electrostatic charge than that of pure COC. In addition, the polar molecular additives also improve the electret properties of COC due to micro-cavities formation and the interactions between molecules and polymer. Our newly developed blended electret material has excellent mechanical properties and is easy to use when compared to using Teflon Fluorinated Ethylene Propylene (FEP) and polypropylene (PP). A feasibility study of a micro electrostatic power generator based on our blended electret material was performed. Experimental results demonstrate the feasibility and effectiveness of this new type of micro electrostatic power generator.

Paper Details

Date Published: 18 April 2008
PDF: 8 pages
Proc. SPIE 6928, Active and Passive Smart Structures and Integrated Systems 2008, 69281V (18 April 2008); doi: 10.1117/12.775982
Show Author Affiliations
Wen-Ching Ko, National Taiwan Univ. (Taiwan)
Bor-Shiun Lee, National Taiwan Univ. (Taiwan)
Jia-Lun Chen, National Taiwan Univ. (Taiwan)
Shun-Chi Lin, National Taiwan Univ. (Taiwan)
Wen-Jong Wu, National Taiwan Univ. (Taiwan)
Chih-Kung Lee, National Taiwan Univ. (Taiwan)
Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 6928:
Active and Passive Smart Structures and Integrated Systems 2008
Mehdi Ahmadian, Editor(s)

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