Preparation and Device Applications of Ferroelectric β-PVDF Films

Abstract

Organic ferroelectric materials have unique characters comparing to their inorganic counterparts in electronics because they show the advantages such as low cost, lightweight, small thermal budget, flexible and nontoxic characteristics. The ferroelectric poly(vinylidene fluoride) (PVDF) is mostly desired for memory devices due to its polar phase. To obtain the ferroelectric memory devices for data storage, ultrathin PVDF films are required to allow for low operation voltages with both small roughness and free of pin-holes. Micronmeter thick films of ferroelectric phase PVDF can be easily achieved by many preparation methods. But the nanofilms could be mainly fabricated by coating method and Langmuir-Blodgett deposition technique. Meanwhile, according to the structure of devices, four types of organic memory cells using ferroelectric phase PVDF films were introduced, such as memory based on metal/organic semiconductor/metal ferroelectric tunnel junctions, organic capacitors, field effect transistor and organic diodes. The research has been mainly done in Zhang's laboratory from September 2016 to explore the preparation and potential applications of ferroelectric PVDF films. In this chapter, we summarize several device investigations and show the PVDF films have the promising memory applications.

Recent advances in flexible PVDF based piezoelectric polymer devices for energy harvesting applications

“…Also, considering the other existing ferroelectric semicrystalline polymers, PVDF is vastly used and find more attractive research interest in the piezoelectric energy harvesting applications. Because of the unique characteristics includes fast-electro-mechanical response, high mechanical stability, low acoustic impedance and excellent piezo and ferroelectric response (Jing and Kar-Narayan, 2018;Ruan et al, 2018b) all these characteristics (Cardoso et al, 2018;Voet et al, 2014).…”

“…Also, considering the other existing ferroelectric semicrystalline polymers, PVDF is vastly used and find more attractive research interest in the piezoelectric energy harvesting applications. Because of the unique characteristics includes fast-electro-mechanical response, high mechanical stability, low acoustic impedance and excellent piezo and ferroelectric response (Jing and Kar-Narayan, 2018; Ruan et al, 2018b). The other copolymers belongs to PVDF family includes, poly (vinylidene fluoride-trifluoroethylene) (P[VDF-TrFE]), poly (vinylidene fluoride-tetrafluoroethylene) (P[VDF-TeFE]), and poly (vinylidene cyanide-vinyl acetate) (P[VDCN-VAC]) and poly(vinylidene fluoride-hexafluoropropylene) (P[VDF-HFP]) are also exhibit all these characteristics (Cardoso et al, 2018; Voet et al, 2014).…”

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

“…[32] The β-phase is the desirable phase owing to its ferroelectric nature. [33] Spinning process such as wet spinning, [19] dry spinning, [34] melt spinning, [35] gel spinning, [36] and electrospinning [37] are the most primitive process for producing flexible piezoelectric generator with the ability for mass production. 3D fabric structure has been designed into fabric-based piezoelectric generator as the 3D spacer knitted fabric with the ability to provide power of 1.10-5.10 µW cm −2 under the impact pressures of 0.02-0.10 MPa at a frequency of 1 Hz.…”

Self-polarized Poly(vinylidene fluoride) Ultrathin Film and Its Piezo/Ferroelectric Properties

“…Dewetting frequently occurs if the film is further thinning . Fortunately, Mitsuishi et al − have reported highly oriented PVDF homopolymer Langmuir–Blodgett (LB) nanofilms ranging from 12 to 81 nm, which exhibit an excellent perspective in low-voltage ferroelectric capacitor memory device application.…”