Polarization fatigue in ferroelectric vinylidene fluoride and trifluoroethylene copolymer films

Abstract

In this letter polarization fatigue in ferroelectric polymers has been reported. Experimental results indicate that the driving voltages with lower frequency and higher amplitude should correspond to higher fatigue rates. A universal scaling behavior with N∕f, where N is the number of switching cycles and f is the frequency, is found in the frequency dependence of polarization fatigue. The profile of driving voltages is also found to affect the fatigue behavior. It is believed that the trapped charges, injected from electrodes into films, should make the major contribution to polarization fatigue.

Doped polymer electrodes for high performance ferroelectric capacitors on plastic substrates

“…There have been various studies published on the effect of applied voltage profile, frequency, crystallinity, and operating temperature on polarization fatigue, but most of these studies were done using metal electrodes on silicon substrates. 21,23,24 In contrast, there have been very limited reports on fatigue using polymer electrodes. 12 It has been proposed that fatigue in P(VDF-TrFE) film is related to the injection of charges from electrodes which are subsequently trapped at crystallite boundaries and defects, inhibiting ferroelectric switching and leading to higher fatigue rates.…”

Effect of a driving electric field waveform on piezoelectric displacement of PZT thick films

“…These results suggest that the effective time of applied electric field, as estimated from parameters such as the waveform, number of switching cycles N and frequency f, affects the fatigue behavior of polarization. 14), 15) Figure 6(b) shows the relation between the minimum value of the normalized displacement and the applied field switching frequency. The minimum value of the normalized displacement of the negative field (¹d max /d max0 ) decreased concomitantly with decreasing applied pulse frequency like ¹P r /P r0 in Fig.…”

Recent Development in Polymer Ferroelectric Field Effect Transistor Memory

“…Various properties of metal/ferroelectric thin film/metal (MFM) capacitors have been recently examined including the work function of electrodes, frequency dependent fatigue, thermal history and ferroelectric polymer/metal interface and so on [39][40][41]. The asymmetric polarization switching frequently observed in a capacitor arises from the work function difference of the metal electrodes and the degree of asymmetry increases with the increasing work function difference.…”

“…Another interesting result is the frequency dependence of a metal/P(VDF-TrFE)/metal capacitor in which the driving voltages with lower frequency and higher amplitude correspond to higher fatigue rates. Zhu et al have proposed a universal scaling behavior with N/f, where N is the number of switching cycles and f is the frequency in the fatigue behavior originating from the trapped charges, injected from electrodes into polymer films [40].…”