有机铁电P(VDF-TrFE)薄膜极化疲劳特性  

Polarization fatigue in ferroelectric vinylidene fluoride and trifluoroethylene copolymer films

作　　者：朱国栋[1] 曾志刚[1] 张莉[1] 严学俭[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《功能材料与器件学报》2007年第3期289-292,共4页Journal of Functional Materials and Devices

摘　　要：本文研究了有机铁电薄膜的极化疲劳过程。研究发现,随着疲劳过程的深入,薄膜铁电峰的峰位逐渐向高电压方向偏移,而薄膜的极化-电压滞洄线也逐渐变得圆滑,且剩余极化值随之下降。进一步的研究表明,只有双极性电压才能导致铁电疲劳的出现,而双极性电压的频率直接影响铁电疲劳速率:频率越高,疲劳越慢。文中对有机铁电疲劳机理做了初步探讨。In this paper we report the studies on polarization fatigue in ferroelectric vinylidene fluoride and trifluoroethylene copolymer films. It is found that, with the increasing number of polarization switching, the voltage corresponding to ferroelectric switching of polarization - voltage hysteresis loops is strongly peak gradually shifts towards higher voltage, the shape modified and becomes rounded, and the remanent polarization is also gradually decreased. Furthermore, experimental results indicate that only bipolar electrical stressing can cause ferroelectric fatigue and the fatigue rate is frequency dependent： the lower the frequency, the higher the fatigue rate. The origin of ferroelectric fatigue in ferroelectric polymers is discussed.

关 键 词：铁电聚合物 极化疲劳 陷阱电荷 

分 类 号：O484.42[理学—固体物理] O482.41[理学—物理]