Title :
Electrical conductivity and electret stability. Why electrets are so stable?
Author_Institution :
Inst. of Molecular Phys., Polish Acad. of Sci., Poznan, Poland
Abstract :
The processes causing a very strong decrease in electrical conductivity after charging the polymer foils are considered. The relation between the shape of electret from and its stability is also discussed. The main reason why the electrical conductivity measured under a strong, static electric field is much lower in comparison with the low field conductivity, is a competition between the rate of the carriers generation in the thermal activation processes and the rate of carriers captured on electrodes and by free charge present in an electret. Eventually the excess charge enter the conduction band causing a decrease of electrical conductivity by a few orders of magnitude
Keywords :
conduction bands; electrets; electrical conductivity; electron traps; foils; high field effects; insulating thin films; organic insulating materials; polymer films; surface charging; carrier capture; carrier generation; charging; conduction band; electret stability; electrical conductivity; electrodes; excess charge; free charge; low field conductivity; polymer foils; strong static electric field; thermal activation processes; Charge measurement; Conductivity measurement; Current measurement; Electrets; Electric variables measurement; Electrodes; Polymers; Shape; Stability; Thermal conductivity;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578054
