Poling and annealing of piezoelectric Poly(Vinylidene fluoride) micropillar arrays

Pariy, Igor O.; Ivanova, Anna; Shvartsman, Vladimir V.; Sukhorukov, Gleb B.; Surmenev, Roman A.

doi:10.1016/j.matchemphys.2019.122035

Cited by 43 publications

(22 citation statements)

References 45 publications

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“…Using this technique, the polarized state can be qualitatively distinguished based on the deviation of the phase angles between the control phase and the fully polarized phase (for details, see Note S1 in the Supporting Information). [ 41 ] As shown in Figure a, we applied different bias voltages to the perovskite films, i.e., −8 V for area A, +8 V for area B, and 0 V for area C. The applied voltages −8 or +8 V will fully polarize the PVDF:DH and perovskites in completely opposite directions, respectively. [ 20 ] Figure 3b shows the phase angle distribution corresponding to the respective areas marked in Figure 3a.…”

Section: Resultsmentioning

confidence: 99%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Chen

Liu

et al. 2022

Advanced Materials

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The built‐in electric field (BEF) intensity of silicon heterojunction solar cells can be easily enhanced by selective doping to obtain high power conversion efficiencies (PCEs), while it is challenging for perovskite solar cells (pero‐SCs) because of the difficulty in doping perovskites in a controllable way. Herein, an effective method is reported to enhance the BEF of FA0.92MA0.08PbI3 perovskite by doping an organic ferroelectric material, poly(vinylidene fluoride):dabcoHReO4 (PVDF:DH) with high polarizability, that can be driven even by the BEF of the device itself. The polarization of PVDF:DH produces an additional electric field, which is maintained permanently, in a direction consistent with that of the BEF of the pero‐SC. The BEF superposition can more sufficiently drive the charge‐carrier transport and extraction, thus suppressing the nonradiative recombination occurring in the pero‐SCs. Moreover, the PVDF:DH dopant benefits the formation of a mesoporous PbI2 film, via a typical two‐step processing method, thereby promoting perovskite growth with high crystallinity and a few defects. The resulting pero‐SC shows a promising PCE of 24.23% for a 0.062 cm2 device (certified PCE of 23.45%), and a remarkable PCE of 22.69% for a 1 cm2 device, along with significantly improved moisture resistances and operational stabilities.

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Section: Resultsmentioning

confidence: 99%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Chen

Liu

et al. 2022

Advanced Materials

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“…Such plasmon‐assisted nanopoling is reproducible and controllable with irradiation power, which can be monitored with plasmon resonances. Scanning the laser across the Au/PVDF films can selectively generate patterned piezophases, which have potential applications for piezoelectronic nanodevices, [ 38 ] high‐density data storage, [ 39 ] and anticounterfeiting. [ 45 ]…”

Section: Discussionmentioning

confidence: 99%

“…As the plasmonic heating of individual Au NP is in the scale of <10 nm, it provides a facile and efficient strategy for nanophase transformation, which has important applications in piezoelectric nanodevices and high-density data storage. [38,39]…”

mentioning

confidence: 99%

Plasmon‐Assisted Nanopoling of Poly(Vinyl Difluoride) Films

Chen

Wang

Zhai

et al. 2021

Advanced Optical Materials

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without post-treatment. [15,16] Common strategies of generating β-phased PVDF include mechanical (stretching, pressing, and shearing) poling, [17][18][19] electric poling, [20] electrospinning, [21][22][23] and other unconventional methods. [24][25][26] These methods always require harsh conditions (high temperature and high voltage) and complicated instruments. In some cases, where the PVDF films are thin (<300 nm), poling can be achieved simply by thermal annealing; [27] however, it has no local selectivity, which is not compatible for integrated piezoelectronic nanodevices.Optical field due to its electromagnetic feature can also be applied for poling molecules. [28][29][30] It has unique advantages of local selectivity, fast modulation, and remote controllability. However, such poling is only transient, which is not useful for bistate devices that require long-term stability.Plasmons, collective oscillations of the free electron gas density at optical frequency, can be a good electromagnetic field condenser as well as an absorber of light. It converts photon energy efficiently into huge amount of local heating, which has been widely used for nanowelding, particle deformation, seawater desalination, and photothermal therapy. [31][32][33][34][35][36][37] By using small gold nanoparticles (Au NPs) as the heating source, it can be potentially used as a nanoheater to selectively pole the PDVF films with light, which is beyond the diffraction limit.In this paper, we show that the thermal effect induced by plasmonic heating can pole the PVDF films. As the plasmonic heating of individual Au NP is in the scale of <10 nm, it provides a facile and efficient strategy for nanophase transformation, which has important applications in piezoelectric nanodevices and high-density data storage. [38,39] Results and DiscussionThe thermal effect can improve the chain movement, which promotes the phase transformation of PVDF. [9,10] As shown in Figure 1a, the PVDF films annealed at 90 °C present a Raman peak at 840 cm −1 (β phase), while the unannealed films show a peak at 797 cm −1 (α phase), which matches the Raman spectrum of the PVDF powders (Figure S1, Supporting Information). This thermal poling is very reproducible to PVDF films of different thicknesses as all of them exhibit the β phase peak after annealing although the intensities are different (Figure 1b). The intensity of α phase peak increases as the PVDF films get thicker, which is because Plasmonic nanoheating can be utilized to induce nanophase transformation, which has important implications for nano-optoelectronics, nanopiezoelectronics, and high-density data storage. Herein, optical poling of poly(vinyl difluoride) (PVDF) is shown with the assistance of surface plasmons. The ultrathin PVDF films are sandwiched between gold nanoparticles (Au NPs) and a gold film. By irradiating the Au NPs with continuouswave laser, nanoannealing of the PVDF films is realized, which locally transforms the PVDF from α phase to β phase as evidenced by Raman spectroscopy. This nanopha...

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“…[ 56 ] ), and/or as an increase in the overall crystallinity ( X c ) of the material. [ 57–59 ] Accordingly, the percent crystallinity (%) can be quantified by measuring the enthalpy of melt

Δ H_{normalm}

of the sample divided by the enthalpy of melt

Δ H_{normalm}^{0}

of fully crystalline PVDF (104.6 J g −1 ) [ 60 ] using Equation (1).

X_{normalc} = Δ H_{normalf} (T_{normalm}) / Δ H_{normalf}^{0} (T_{normalm}^{0})

…”

Section: Methodsmentioning

confidence: 99%

A Piezo Smart‐Braid Harvester and Damper for Multifunctional Fiber Reinforced Polymer Composites

2020

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The past decade has seen the rapid development of wearable electronics, wireless sensor networks (WSNs), and self‐powered implantable sensors. However, these devices usually require a continuous source of power supply to operate safely and accurately while having the least reliance on conventional battery systems—due to the recharging/maintenance burdens of batteries. Vibration‐based piezoelectric energy harvesting (PEH) from environment, man‐made machinery, and human body movements seems to be a promising solution. Herein, the first integration of a piezoelectric poly(vinylidene fluoride) (PVDF) yarn‐braid microgenerator into a fiber reinforced polymer composite (FRPC) structure is reported. It is demonstrated that the developed smart composite exhibits multifunctional performances, including simultaneous structural (with ≈10% increased Young's modulus), energy harvesting, and vibration damping (with a damping factor of 125%). The results show that an average output voltage of 3.6 V and a power density of 2.2 mW cm−3 can be achieved at strains below 0.15%, under cyclic loading tests between 1 and 10 Hz. Moreover, noticeable improvements are made in the crystallinity percentage and β‐phase content of as‐received PVDF yarns by, respectively, ≈34% and ≈37%, as a result of the applied coreless radial and axial corona poling techniques.

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Poling and annealing of piezoelectric Poly(Vinylidene fluoride) micropillar arrays

Cited by 43 publications

References 45 publications

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Plasmon‐Assisted Nanopoling of Poly(Vinyl Difluoride) Films

A Piezo Smart‐Braid Harvester and Damper for Multifunctional Fiber Reinforced Polymer Composites

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