Title :
Numerical study of space charge dispersive transport in non-polar electrets
Author :
Cao, Yang ; Xia, Zhongfu ; Yuan, Gang ; Zhang, Hongyan ; Lin, Huamao ; Zhu, Jianwei
Author_Institution :
Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai, China
Abstract :
The space-charge dispersive transport in non-polar electrets is studied numerically and experimentally. The dynamics are investigated through continuous-time random walks by Monte Carlo simulation. The stepping-time density of Montroll (ψ(t)∝t-1-α) is applied for computation. By keeping the temperature at each stepping interval, charge transport under isothermal conditions is studied to simulate the real charge decay process in non-polar electrets aged at fixed temperatures. Experiments on polypropylene film electrets were carried out for comparison. Samples were constant-voltage corona charged at RT for 10 minutes and then aged at various selected temperatures for given time periods. The mean charge depth was measured for comparison to numerical results by means of heat pulse technique. Experimental results of other non-polar electrets are also given to support our model
Keywords :
Monte Carlo methods; corona; electrets; organic insulating materials; polymer films; random processes; space-charge-limited conduction; surface charging; 10 min; 20 C; Monte Carlo simulation; charge decay process; charge transport; constant-voltage corona charging; continuous-time random walks; dynamics; heat pulse technique; isothermal conditions; mean charge depth; nonpolar electrets; polypropylene film electrets; space charge dispersive transport; stepping-time density; Aging; Computational modeling; Corona; Current measurement; Dispersion; Electrets; Isothermal processes; Pulse measurements; Space charge; Temperature;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578059