Ultraviolet irradiation induced polarization restoration in electrically fatigued ferroelectric polymer films

Abstract

Polarization fatigue is a kind of phenomenon usually observed in most ferroelectric films, which severely degrades the electrical performance of ferroelectric devices. How to restore those degraded polarization as well as how to improve fatigue endurance has been attracting much attention. Here, we report the observation of ultraviolet (UV) irradiation induced polarization restoration in ferroelectric polymer films. Large numbers of experiments indicate that the simultaneous application of UV irradiation and DC bias voltage will result in polarization restoration, which is dependent on both electrical polarity of DC bias and the UV intensity. Repeated fatigue and restoration measurements are also conducted. Based on fatigue mechanism in ferroelectric polymer films, UV-induced restoration is discussed.

Influence of physical aging of ferroelectric vinylidene fluoride copolymer films on their structural and electrophysical characteristics

“…In this problem, it is important to study the processes of electrical aging (fatigue). Such processes are typical for both inorganic materials 5–18 and organic ferroelectrics 19–26 . The general conclusion following from these papers is that the formation of a space charge in the material plays an important role in the aging process.…”

“…Such processes are typical for both inorganic materials [5][6][7][8][9][10][11][12][13][14][15][16][17][18] and organic ferroelectrics. [19][20][21][22][23][24][25][26] The general conclusion following from these papers is that the formation of a space charge in the material plays an important role in the aging process. A feature of polymer ferroelectrics, including the copolymers considered in this study, is that they are characterized by high coercive and breakdown fields.…”

Facile fabrication of highly ordered poly(vinylidene fluoride-trifluoroethylene) nanodot arrays for organic ferroelectric memory

“…Ferroelectric polymers, in particular, the polyvinylidene fluoride (PVDF) and its copolymers with trifluoroethylene (TrFE), have received intensive interests due to their useful dielectric, ferroelectric, pyroelectric, and piezoelectric properties. [1][2][3][4][5][6] One of the emerging research topics about ferroelectric P(VDF-TrFE) copolymer is to scale down its size to nanometer dimension, which may offer unique characteristics and extend its applications ranging from nanosensors to non-volatile memory and nanogenerators. [7][8][9] The fabrication of two-dimensional (2D) ferroelectric nanodot arrays is an ideal approach for forming isolated nanodomains.…”