On the charge storage and decay mechanisme in silicon dioxide electrets

Olthuis, W. and Bergveld, P. (1992) On the charge storage and decay mechanisme in silicon dioxide electrets. IEEE Transactions on Electrical Insulation, 27 (4). pp. 691-697. ISSN 0018-9367

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Abstract:	A mechanism for both the storage and the decay of charge in a charged silicon dioxide layer is proposed. The oxide layer needs neutral electron traps to obtain stable trapped negative charge, after having been charged, resulting in an electret that can be applied in microphones. The deprotonization of the silanol groups, followed by charge injection, results in an electrochemical reaction with immobile SiO- as one of the reaction products. Decay of the stable charge thus obtained can occur by the clustering of water molecules at inner silanol groups, resulting in a conductive hydrogen bonded network, which eventually leads to the discharge of the electret. Measurement results are presented, showing a considerable decrease in surface conductivity, after having grafted the SiO2 surface, resulting in covalently bonded, relatively long octadecyl silane chains
Item Type:	Article
Copyright:	©1992 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/15307
Official URL:	http://dx.doi.org/10.1109/14.155784
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