Title :
The role of space charges on polarization fatigue in ferroelectric P(VDF-TrFE) copolymer films
Author :
Zhu, Guodong ; Luo, XiaoYa ; Zhang, JiHao ; Zeng, ZhiGang ; Yan, XueJian
Author_Institution :
Dept. of Mater. Sci., Fudan Univ., Shanghai
Abstract :
Recently, in our lab we have performed some systemic studies on polarization fatigue in ferroelectric polymers and four possible contributing factors (applied voltages, operation temperature, film crystallinity and electrode structure) are characterized by a homemade sawyer-Tower circuit. All fatigue phenomena observed in these experiments seem to imply the effect of space charges, which are injected from electrodes into ferroelectrics and trapped at the boundaries of crystallites or/and by defects. We believe that the interaction between trapped charges and electric dipoles in ferroelectrics has inhibited ferroelectric switching in polymers and induced the occurrence of polarization fatigue.
Keywords :
crystallites; ferroelectric thin films; polarisation; polymer blends; polymer films; space charge; P(VDF-TrFE) copolymer films; crystallites; defects; electrodes; ferroelectric films; homemade sawyer-Tower circuit; polarization fatigue; space charge; Crystallization; Electrodes; Fatigue; Ferroelectric films; Ferroelectric materials; Polarization; Polymer films; Space charge; Temperature; Voltage;
Conference_Titel :
Electrets, 2008. ISE-13. 13th International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-1850-3
Electronic_ISBN :
978-1-4244-1851-0
DOI :
10.1109/ISE.2008.4814046
