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Ferroelectric Thin Films and Devices
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Ferroelectric Thin Films and Devices

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 23285

Special Issue Editor

Prof. Dr. Andrey Tumarkin

E-Mail Website
Guest Editor
Department of Physical Electronics and Technology, St. Petersburg State Electrotechnical University (LETI), 5 prof. Popov Str., 197376 St. Petersburg, Russia
Interests: ferroelectric, dielectric, and superconducting film growth and characterization; ferroelectric films for microwave applications; ferroelectric tunable and storage devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We invite researchers to submit original innovative research works to this Special Issue on “Ferroelectric Thin Films and Devices”.

Ferroelectrics have been studied for many years and have been found to be particularly important materials for application in piezoelectric, pyroelectric, electrostrictive, and linear and nonlinear high frequency and optical devices. However, due to various reasons related to both device electronics and materials technology, it is only in the past two decades that intensive development efforts are being made in this direction. A wide range of materials has been produced, and some excellent-quality thin-film, polycrystalline, and single-crystal ferroelectrics have been obtained. The main driving force for this resurgent interest is the potential for substantial miniaturization of components and systems (accompanied also by a large cost reduction) and the potential for integration with microelectronic circuits due to the development of thin film ferroelectric technology.

The aim of this Special Issue is to highlight the most recent advancements in the science and technology of ferroelectric materials, covering a broad range of fields from theory and modeling, via processing and characterization thereof, to the development of new applications and devices, through a combination of original research papers and review articles from leading groups around the world.

In particular, the topics of interest include but are not limited to:

  • Ferroelectric film growth and characterization;
  • Novel ferroelectric/piezoelectric/multiferroic thin films;
  • Novel materials for ferroelectric memories and capacitors;
  • Tunable ferroelectric devices for high frequency applications;
  • Energy harvesting, piezoelectric, IR, and terahertz sensors;
  • Bulk acoustic devices (BAW & FBAR).

Prof. Dr. Andrey Tumarkin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (7 papers)

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Research

12 pages, 4097 KiB  
Article
Structural and Electric Properties of Epitaxial Na0.5Bi0.5TiO3-Based Thin Films
by Bruno Magalhaes, Stefan Engelhardt, Christian Molin, Sylvia E. Gebhardt, Kornelius Nielsch and Ruben Hühne
Coatings 2021, 11(6), 651; https://doi.org/10.3390/coatings11060651 - 28 May 2021
Cited by 3 | Viewed by 2492
Abstract
Substantial efforts are dedicated worldwide to use lead-free materials for environmentally friendly processes in electrocaloric cooling. Whereas investigations on bulk materials showed that Na0.5Bi0.5TiO3 (NBT)-based compounds might be suitable for such applications, our aim is to clarify the [...] Read more.
Substantial efforts are dedicated worldwide to use lead-free materials for environmentally friendly processes in electrocaloric cooling. Whereas investigations on bulk materials showed that Na0.5Bi0.5TiO3 (NBT)-based compounds might be suitable for such applications, our aim is to clarify the feasibility of epitaxial NBT-based thin films for more detailed investigations on the correlation between the composition, microstructure, and functional properties. Therefore, NBT-based thin films were grown by pulsed laser deposition on different single crystalline substrates using a thin epitaxial La0.5Sr0.5CoO3 layer as the bottom electrode for subsequent electric measurements. Structural characterization revealed an undisturbed epitaxial growth of NBT on lattice-matching substrates with a columnar microstructure, but high roughness and increasing grain size with larger film thickness. Dielectric measurements indicate a shift of the phase transition to lower temperatures compared to bulk samples as well as a reduced permittivity and increased losses at higher temperatures. Whereas polarization loops taken at −100 °C revealed a distinct ferroelectric behavior, room temperature data showed a significant resistive contribution in these measurements. Leakage current studies confirmed a non-negligible conductivity between the electrodes, thus preventing an indirect characterization of the electrocaloric properties of these films. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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9 pages, 17685 KiB  
Article
Formation of Millimeter Waves with Electrically Tunable Orbital Angular Momentum
by Andrey Altynnikov, Roman Platonov, Andrey Tumarkin, Peter K. Petrov and Andrey Kozyrev
Coatings 2021, 11(5), 569; https://doi.org/10.3390/coatings11050569 - 13 May 2021
Cited by 3 | Viewed by 2423
Abstract
A method for forming electromagnetic waves with a tunable nonzero orbital angular momentum (OAM) is proposed. The approach is based on transforming an incident plane wave into a helical one using an electrically tunable ferroelectric lens. It uses high-resistive thin/thick film electrodes with [...] Read more.
A method for forming electromagnetic waves with a tunable nonzero orbital angular momentum (OAM) is proposed. The approach is based on transforming an incident plane wave into a helical one using an electrically tunable ferroelectric lens. It uses high-resistive thin/thick film electrodes with a special discrete topology. The correlation between film electrodes topology and the highest order of OAM modes that the lens can form is described. A lens prototype based on Ba0.55Sr0.45TiO3 ferroelectric material and operating at a frequency of 60 GHz was designed, manufactured, and tested. The amplitude and phase distribution of the OAM wave with l = +1 formed by prototype were measured to confirm the effectiveness of the proposed method. The proposed lens has a combination of advantages such as low dimensions, electrical control over the OAM modes, and the possibility to operate in the millimeter wavelength range. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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11 pages, 2608 KiB  
Article
Electron-Beam Domain Patterning in Sr0.61Ba0.39Nb2O6 Crystals
by Tatyana R. Volk, Lyudmila S. Kokhanchik, Yadviga V. Bodnarchuk, Radmir V. Gainutdinov, Eugene B. Yakimov and Lyudmila I. Ivleva
Coatings 2020, 10(3), 299; https://doi.org/10.3390/coatings10030299 - 23 Mar 2020
Cited by 3 | Viewed by 2490
Abstract
The characteristics of electron-beam domain writing (EBDW) on the polar and nonpolar surfaces of the field-cooled (FC) and zero-field cooled (ZFC) Sr0.61Ba0.39Nb2O6 (SBN) crystals are presented in the range of accelerating voltage U from 10 to [...] Read more.
The characteristics of electron-beam domain writing (EBDW) on the polar and nonpolar surfaces of the field-cooled (FC) and zero-field cooled (ZFC) Sr0.61Ba0.39Nb2O6 (SBN) crystals are presented in the range of accelerating voltage U from 10 to 25 kV. The exposure characteristics of the domain diameter d and length Ld (when writing on the polar and nonpolar surfaces, respectively) were measured. With increasing exposure time, d tends to a saturation value, whereas Ld grows linearly, the frontal velocity Vf being of 40 μm/s. At U = 25 kV the achieved d and Ld are of 7 and 40 µm, respectively. The observed peculiar features of EBDW—specifically the domain widening with exposure times and the effect of the polarization state of the crystal on the domain stability—are accounted for by the relaxor features inherent to this material. The effects of electron-beam (EB) irradiation on the local hysteresis loops is evidence of a domain fixation. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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15 pages, 2011 KiB  
Article
Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix
by Nikolay Mukhin, Irina Sokolova, Dmitry Chigirev, Lyudmila Rudaja, Galina Lebedeva, Rene Kastro, Maxim Bol’shakov, Marc-Peter Schmidt and Soeren Hirsch
Coatings 2020, 10(3), 286; https://doi.org/10.3390/coatings10030286 - 19 Mar 2020
Cited by 5 | Viewed by 2962
Abstract
The polycondensation of 5,5-methylene bis(2-aminophenol) and the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline (molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize a new heat resistant binder of the composites for microelectronics: poly(o-hydroxyamide) (POA) and poly(amido-o-hydroxy amide) [...] Read more.
The polycondensation of 5,5-methylene bis(2-aminophenol) and the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline (molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize a new heat resistant binder of the composites for microelectronics: poly(o-hydroxyamide) (POA) and poly(amido-o-hydroxy amide) (POA-F). The thermal stability of synthesized polymer coatings, as well as based on them photosensitive compositions with a naphthoquinondiazide photosensitive component were studied in the temperature range from 100 to 500 °C. Ferroelectric composites with nanodispersed lead titanate zirconate powder filler were formed based on these polymer matrices. By manipulating the conditions of the polymer formation, we obtained matrices with different stiffnesses, which reflected on the properties of the composite. The electrophysical parameters of the synthesized polymer and ferroelectric composite coatings were measured in the frequency range from 0.1 Hz to 1.5 GHz and the temperature range from 0 to 300 °C. The frequency and temperature stability of the dielectric constant of ferroelectric composite coatings up to 10 MHz and 300 °C, respectively, are noted. The influence of the composition and structure of the polymer matrix and the grain/matrix interfaces on the thermal stability of the dielectric parameters of composite films is estimated. The shift of the phase transition region toward higher temperatures in the composite structure, as well as the sufficient rigidity of the poly(benzoxazole) matrix, provide high temperature and frequency stability of the dielectric constant of the studied composites. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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9 pages, 391 KiB  
Article
Heterostructures “Ferroelectric Film/Silicon Carbide” for High Power Microwave Applications
by Andrey Tumarkin, Alexander Gagarin, Michail Zlygostov, Evgeny Sapego and Andrey Altynnikov
Coatings 2020, 10(3), 247; https://doi.org/10.3390/coatings10030247 - 07 Mar 2020
Cited by 5 | Viewed by 2462
Abstract
The ferroelectric barium–strontium titanate (BST) multi-layer structure has been formed directly on silicon carbide by serial deposition and “in situ” annealing of layers. This approach allowed us to achieve the high-quality perovskite lattice of ferroelectric that provides the best combination of high tunability [...] Read more.
The ferroelectric barium–strontium titanate (BST) multi-layer structure has been formed directly on silicon carbide by serial deposition and “in situ” annealing of layers. This approach allowed us to achieve the high-quality perovskite lattice of ferroelectric that provides the best combination of high tunability and low losses for BST/SiC structures at microwaves. Electric characteristics of BST/SiC planar capacitor structures were studied under the high level of microwave power for the first time. The BST/SiC structure consisted of highly oriented ferroelectric film on highly heat-conducting substrate have demonstrated the absence of the overheating of the active area of the capacitor under dissipated power density up to 125 W/mm 2 . Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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12 pages, 10604 KiB  
Article
A Tunable Beamforming Ferroelectric Lens for Millimeter Wavelength Ranges
by Roman Platonov, Andrey Altynnikov and Andrey Kozyrev
Coatings 2020, 10(2), 180; https://doi.org/10.3390/coatings10020180 - 16 Feb 2020
Cited by 7 | Viewed by 3531
Abstract
The advanced design of a millimeter-wave quasi-optical beamforming device (QOBD) based on the ferroelectric ceramic was elaborated and considered. Among the advantages of the proposed design are simplicity and cost-effectiveness in contrast to conventional analog and digital beamforming devices based on array antennas. [...] Read more.
The advanced design of a millimeter-wave quasi-optical beamforming device (QOBD) based on the ferroelectric ceramic was elaborated and considered. Among the advantages of the proposed design are simplicity and cost-effectiveness in contrast to conventional analog and digital beamforming devices based on array antennas. The use of ferroelectric ceramic in the QOBD design allows operating in a wide frequency range up to 100 GHz. The advanced topology of discrete radiotransparent electrodes to provide a realization of different beamforming functions such as beam focusing and beam scanning was considered. The prototype of the proposed QOBD was designed to operate at 60 GHz. The measured radiation pattern of the QOBD prototype is in good agreement with the simulated one. Measurements demonstrate decreasing of beamwidth of the primary antenna radiation pattern by the lens prototype operating in the beam focusing regime. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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19 pages, 5881 KiB  
Article
Using Annealing Treatment on Fabrication Ionic Liquid-Based PVDF Films
by Yung Ting, Suprapto, Naveen Bunekar, Kulandaivel Sivasankar and Yopan Rahmad Aldori
Coatings 2020, 10(1), 44; https://doi.org/10.3390/coatings10010044 - 03 Jan 2020
Cited by 17 | Viewed by 5915
Abstract
In this study, a simple method to obtain pure β-phase directly from the melt process is proposed. A series of PVDF and ionic liquid (IL) was prepared by a solvent casting method with appropriate associated with the subsequent annealing treatment. IL plays a [...] Read more.
In this study, a simple method to obtain pure β-phase directly from the melt process is proposed. A series of PVDF and ionic liquid (IL) was prepared by a solvent casting method with appropriate associated with the subsequent annealing treatment. IL plays a role of filler, which can create strong electrostatic interaction with PVDF matrix and directly induce β-phase crystallization on the PVDF during the melt. PVDF film sample is immersed in hot water for annealing treatment at different temperatures (25 °C to 70 °C). We found that annealing in high temperatures especially can not only increase more IL inserted into the amorphous region of polymer matrix to make more phase transformation, but also accelerate IL removal. Characteristics and performance of the PVDF films were investigated by use of FTIR, XRD, SEM, and AFM. Piezoelectric coefficient d33 as well as d31, degree of crystallinity, and sensitivity are measured in experiment to verify the performance of PVDF film. Full article
(This article belongs to the Special Issue Ferroelectric Thin Films and Devices)
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