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Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes EI CPCI-S
会议论文 | 2018 , 10823 | Conference on Nanophotonics and Micro/Nano Optics IV
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Abstract :

Controllable growth of ZnO nanostructures were realized on the surface patterned vertical-type GaN light emitting diodes (LEDs) by chemical solution method at low temperature. Aqueous ammonia has been added to manipulate the pH values of the growth solution to optimize the morphology of the ZnO nanostructures and light extraction efficiency from GaN LED surface. It is revealed that ZnO nanostructures were mainly grown on the tips of the GaN surface pyramids at pH value of 8.5. With decreasing pH value, ZnO nanostructures were observed grown both on tip and bottom of the GaN pyramids. On the contrary, the growth of ZnO nanostructures was greatly inhibited by increasing pH value above 10. The electroluminescence (EL) spectra intensity was enhanced by 40% for GaN LEDs topped with ZnO nanostructures at pH value of 8.5. This enhancement is attributed to the ZnO nanostructures tip-grown on vertical GaN LEDs effectively reducing the total internal reflection and minimizing Fresnel loss.

Keyword :

nanostructures Solid-state lighting GaN extraction efficiency surface texturing light emitting diodes

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GB/T 7714 Li, Yuanjie , Sun, Wenci , Wang, Hong et al. Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes [C] . 2018 .
MLA Li, Yuanjie et al. "Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes" . (2018) .
APA Li, Yuanjie , Sun, Wenci , Wang, Hong , Zhang, Minyan , Yun, Feng . Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes . (2018) .
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Sandwich structured poly(vinylidene fluoride)/polyacrylate elastomers with significantly enhanced electric displacement and energy density EI SCIE
期刊论文 | 2018 , 6 (47) , 24367-24377 | JOURNAL OF MATERIALS CHEMISTRY A
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Abstract :

While polymer dielectric capacitors are preferred energy-storage components in electrical power systems, the low achievable energy densities (U-e) of existing polymer systems restrict their miniaturization and advanced applications. Here, we report the design and preparation of all-polymer sandwich structured films comprised of two outer layers of poly(vinylidene fluoride) (PVDF) to provide high breakdown strength and an interlayer of acrylic rubber dielectric elastomers (DEs) to offer high electric displacement. The energy storage performance of the sandwich architecture films can be significantly improved by modulating the thickness of DEs, as confirmed by the electric displacement-field (D-E) loops and leakage current measurements. Markedly enhanced electric displacement (D-max - D-r = 11.01 C cm(-2)) and a breakdown strength E-b of 438 MV m(-1) have been achieved in the sandwich structured films with an optimum DE central layer thickness of 4 m, which leads to an ultrahigh energy storage density of 20.92 J cm(-3) and a high efficiency of 72%, by far the highest values ever achieved in all-polymer dielectrics. Excellent reliability in energy storage performance demonstrated by consecutive cycling is presented in the prepared layered films. The spatial organization of the DE into the sandwich structures provides an effective way for achieving the high energy storage capability for flexible energy storage devices.

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GB/T 7714 Chen, Jie , Wang, Yifei , Xu, Xinwei et al. Sandwich structured poly(vinylidene fluoride)/polyacrylate elastomers with significantly enhanced electric displacement and energy density [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (47) : 24367-24377 .
MLA Chen, Jie et al. "Sandwich structured poly(vinylidene fluoride)/polyacrylate elastomers with significantly enhanced electric displacement and energy density" . | JOURNAL OF MATERIALS CHEMISTRY A 6 . 47 (2018) : 24367-24377 .
APA Chen, Jie , Wang, Yifei , Xu, Xinwei , Yuan, Qibin , Niu, Yujuan , Wang, Qing et al. Sandwich structured poly(vinylidene fluoride)/polyacrylate elastomers with significantly enhanced electric displacement and energy density . | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (47) , 24367-24377 .
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Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization EI SCIE Scopus
期刊论文 | 2018 , 44 , 364-370 | NANO ENERGY
WoS CC Cited Count: 13 SCOPUS Cited Count: 17
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Abstract :

Sandwich-structured polymer nanocomposites that provide a pathway to overcome the paradox between permittivity and breakdown strength ever existing in dielectric materials are receiving increasing attentions for their superior energy storage performance. Despite certain advances obtained in previous effort, further enhancement of the energy density by structure optimizing is still a challenge. Herein, we present a newly designed sandwich-structured barium titanate/poly(vinylidene fluoride-co-hexafluoropropylene) (BaTiO3/P(VDF-HFP)) nanocomposite via layer-by-layer tape casting process, where high contents of BaTiO3 nanoparticles are dispersed in the middle layer to offer high permittivity, while two outer layers containing small amounts of BaTiO3 provide favorable breakdown strength. The solution-processed nanocomposites with an optimal composition exhibits an ultrahigh discharged energy density of 26.4 J cm(-3) and a superior discharged efficiency of 72%, which are by far the highest values ever achieved in sandwich-structured dielectric polymer composites. It is revealed that the designed structure can enhance the breakdown strength and discharged efficiency by preventing the charge injection from electrodes and impeding the development of electrical tress during breakdown process, as confirmed by the leakage current and thermally stimulated depolarization current measurements, as well as the finite element simulations. This work represents a new design paradigm to exploit advanced dielectric materials for electrical energy storage applications.

Keyword :

Dielectric breakdown Sandwich structure Electrical energy storage Capacitor Polymer nanocomposites

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GB/T 7714 Wang, Yifei , Wang, Linxi , Yuan, Qibin et al. Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization [J]. | NANO ENERGY , 2018 , 44 : 364-370 .
MLA Wang, Yifei et al. "Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization" . | NANO ENERGY 44 (2018) : 364-370 .
APA Wang, Yifei , Wang, Linxi , Yuan, Qibin , Chen, Jie , Niu, Yujuan , Xu, Xinwei et al. Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization . | NANO ENERGY , 2018 , 44 , 364-370 .
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Relaxor ferroelectric 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 ceramic capacitors with high energy density and temperature stable energy storage properties EI SCIE Scopus
期刊论文 | 2017 , 5 (37) , 9552-9558 | JOURNAL OF MATERIALS CHEMISTRY C | IF: 5.976
WoS CC Cited Count: 15
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Abstract :

A relaxor ferroelectric ceramic for high energy storage applications based on 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 (0.9BT-0.1BZZ) was successfully fabricated via a conventional solid-state method. The sintered samples have a perovskite structure with a pseudocubic phase, showing a moderate dielectric constant (500-2000), low dielectric loss (tan delta < 0.15) and highly diffusive and dispersive relaxor-like behavior. The weak dielectric nonlinearity exhibits a dielectric constant change of similar to 10% as the bias electric field increases from 0 kV cm(-1) to 40 kV cm(-1). Extra slim polarization-electric field loops accompanying the slow decrease of breakdown strength from 266.5 kV cm(-1) to 217.7 kV cm(-1) are observed in a measured temperature range of 30-150 degrees C. A maximum energy density of 2.46 J cm(-3) was obtained at the electric field of 264 kV cm(-1) close to the breakdown strength at ambient temperature. Temperature stability of both energy density and energy efficiency exists in a wide temperature range, which makes BT-BZZ ceramics promising candidates for high power electric applications.

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GB/T 7714 Yuan, Qibin , Yao, Fangzhou , Wang, Yifei et al. Relaxor ferroelectric 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 ceramic capacitors with high energy density and temperature stable energy storage properties [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2017 , 5 (37) : 9552-9558 .
MLA Yuan, Qibin et al. "Relaxor ferroelectric 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 ceramic capacitors with high energy density and temperature stable energy storage properties" . | JOURNAL OF MATERIALS CHEMISTRY C 5 . 37 (2017) : 9552-9558 .
APA Yuan, Qibin , Yao, Fangzhou , Wang, Yifei , Ma, Rong , Wang, Hong . Relaxor ferroelectric 0.9BaTiO(3)-0.1Bi(Zn0.5Zr0.5)O-3 ceramic capacitors with high energy density and temperature stable energy storage properties . | JOURNAL OF MATERIALS CHEMISTRY C , 2017 , 5 (37) , 9552-9558 .
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Thickness-modulated anisotropic ferromagnetism in Fe-doped epitaxial HfO2 thin films EI SCIE Scopus
期刊论文 | 2017 , 111 (17) | APPLIED PHYSICS LETTERS | IF: 3.495
WoS CC Cited Count: 1
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Abstract :

Epitaxial tetragonal Fe-doped Hf0.95Fe0.05O2 (FHO) thin films with various thicknesses were deposited on (001)-oriented NdCaAlO4 (NCAO) substrates by using a pulsed laser deposition (PLD) system. The crystal structure and epitaxial nature of the FHO thin films were confirmed by typical x-ray diffraction (XRD) theta-2 theta scan and reciprocal space mapping (RSM). The results indicate that two sets of lattice sites exist with two different crystal orientations [(001) and (100)] in the thicker FHO thin films. Further, the intensity of the (100) direction increases with the increase in thicknesses, which should have a significant effect on the anisotropic magnetization of the FHO thin films. Meanwhile, all the FHO thin films possess a tetragonal phase structure. An anisotropy behavior in magnetization has been observed in the FHO thin films. The anisotropic magnetization of the FHO thin films is slowly weakened as the thickness increases. Meanwhile, the saturation magnetization (Ms) of both in-plane and out-of-plane decreases with the increase in the thickness. The change in the anisotropic magnetization and Ms is attributed to the crystal lattice and the variation in the valence of Fe ions. These results indicate that the thickness-modulated anisotropic ferromagnetism of the tetragonal FHO epitaxial thin films is of potential use for the integration of metal-oxide semiconductors with spintronics. Published by AIP Publishing.

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GB/T 7714 Liu, Wenlong , Liu, Ming , Zhang, Ruyi et al. Thickness-modulated anisotropic ferromagnetism in Fe-doped epitaxial HfO2 thin films [J]. | APPLIED PHYSICS LETTERS , 2017 , 111 (17) .
MLA Liu, Wenlong et al. "Thickness-modulated anisotropic ferromagnetism in Fe-doped epitaxial HfO2 thin films" . | APPLIED PHYSICS LETTERS 111 . 17 (2017) .
APA Liu, Wenlong , Liu, Ming , Zhang, Ruyi , Ma, Rong , Wang, Hong . Thickness-modulated anisotropic ferromagnetism in Fe-doped epitaxial HfO2 thin films . | APPLIED PHYSICS LETTERS , 2017 , 111 (17) .
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Low-temperature sintering and enhanced piezoelectric properties of random and textured PIN-PMN-PT ceramics with Li2CO3 EI SCIE Scopus
期刊论文 | 2017 , 100 (3) , 1073-1079 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY | IF: 2.956
WoS CC Cited Count: 2
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Abstract :

Low-temperature sintered random and textured 36PIN-30PMN-34PT piezoelectric ceramics were successfully synthesized at a temperature as low as 950 degrees C using Li2CO3 as sintering aids. The effects of Li2CO3 addition on microstructure, dielectric, ferroelectric, and piezoelectric properties in 36PIN-30PMN-34PT ternary system were systematically investigated. The results showed that the grain size of the specimens increased with the addition of sintering aids. The optimum properties for the random samples were obtained at 0.5wt% Li2CO3 addition, with piezoelectric constant d(33) of 450pC/N, planar electromechanical coupling coefficient k(p) of 49%, peak permittivity epsilon(max) of 25612, remanent polarization P-r of 36.3C/cm(2). Moreover, the low-temperature-sintered textured samples at 0.5wt% Li2CO3 addition exhibited a higher piezoelectric constant d(33) of 560pC/N. These results indicated that the low-temperature-sintered 36PIN-30PMN-34PT piezoelectric ceramics were very promising candidates for the multilayer piezoelectric applications.

Keyword :

sintering sinter low temperature electrical properties texture

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GB/T 7714 Wei, Dandan , Wang, Hong . Low-temperature sintering and enhanced piezoelectric properties of random and textured PIN-PMN-PT ceramics with Li2CO3 [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2017 , 100 (3) : 1073-1079 .
MLA Wei, Dandan et al. "Low-temperature sintering and enhanced piezoelectric properties of random and textured PIN-PMN-PT ceramics with Li2CO3" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 100 . 3 (2017) : 1073-1079 .
APA Wei, Dandan , Wang, Hong . Low-temperature sintering and enhanced piezoelectric properties of random and textured PIN-PMN-PT ceramics with Li2CO3 . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2017 , 100 (3) , 1073-1079 .
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Effect of thickness-dependent crystal mosaicity and chemical defect on electric properties in yttrium-stabilized epitaxial HfO2 thin films EI SCIE Scopus
期刊论文 | 2017 , 110 (12) | APPLIED PHYSICS LETTERS | IF: 3.495
WoS CC Cited Count: 2
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Epitaxial pseudo cubic yttrium-stabilized Y0.05Hf0.95O2 (YHO) thin films with bottom electrode layers of Pr0.5Sr0.5CoO3 were deposited on (001)-oriented LaAlO3 (LAO) substrates by using the pulsed laser deposition system. The crystal structure and thickness of the films were confirmed by theta-2 theta scan and X-ray reflectivity via X-ray diffraction technology, respectively. Reciprocal space mapping (RSM) was performed to clarify the microstructure of the epitaxial YHO films affected by LAO substrates, and the result of symmetric RSMs revealed that the crystal mosaicity of the YHO films increases with the increasing film thicknesses. Moreover, the dominant conduction mechanisms of all the YHO films were ohmic conduction in the low electric field. At a high applied electric field, the YHO-5.4 nm film was determined by the space-charge-limited current behavior, while the samples of the YHO-9.8 nm and YHO-19.2 nm films were determined by ohmic conduction. The temperature-dependent I-V characteristics of the YHO films with different thicknesses have been also obtained, revealing that the current of all the YHO films generally increases with the increase in temperature, which attributed to the crystal mosaicity and chemical defects. Published by AIP Publishing.

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GB/T 7714 Liu, Wenlong , Liu, Ming , Cheng, Sheng et al. Effect of thickness-dependent crystal mosaicity and chemical defect on electric properties in yttrium-stabilized epitaxial HfO2 thin films [J]. | APPLIED PHYSICS LETTERS , 2017 , 110 (12) .
MLA Liu, Wenlong et al. "Effect of thickness-dependent crystal mosaicity and chemical defect on electric properties in yttrium-stabilized epitaxial HfO2 thin films" . | APPLIED PHYSICS LETTERS 110 . 12 (2017) .
APA Liu, Wenlong , Liu, Ming , Cheng, Sheng , Zhang, Ruyi , Ma, Rong , Wang, Hong . Effect of thickness-dependent crystal mosaicity and chemical defect on electric properties in yttrium-stabilized epitaxial HfO2 thin films . | APPLIED PHYSICS LETTERS , 2017 , 110 (12) .
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Ultra-low temperature sintering microwave dielectric ceramics based on Ag2O-MoO3 binary system EI SCIE Scopus
期刊论文 | 2017 , 100 (6) , 2604-2611 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY | IF: 2.956
WoS CC Cited Count: 1
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Abstract :

The Ag2Mo2O7 and Ag6Mo10O33 ceramics for ultra-low temperature co-fired ceramic application were prepared by the solid-state reaction route. The optimized densification temperatures of Ag2Mo2O7 and Ag6Mo10O33 are 460 degrees C and 500 degrees C, respectively. The phase structures and microstructures of these ceramics were systematically studied. The Ag2Mo2O7 ceramic sintered at 460 degrees C/4 h exhibits excellent microwave dielectric properties with epsilon(r)=13.3, Qxf=25 300 GHz and (f)=-142 ppm/degrees C at 9.25 GHz. The Ag6Mo10O33 ceramic sintered at 500 degrees C/4 h shows the microwave dielectric properties with epsilon(r)=14.0, Qxf=8500 GHz and (f)=-50 ppm/degrees C at 9.00 GHz. Moreover, when Ag2Mo2O7 samples are sintered at ultra-low sintering temperatures of 420 degrees C-490 degrees C, the Qxf values of them are all above 20 000 GHz. Besides, the Ag2Mo2O7 ceramic does not react with silver powder or aluminum powder. The variation of relative permittivity, resonant frequency, and Qxf values as a function of operating temperature has been also studied. All the results indicate that the Ag2Mo2O7 ceramic is a good candidate for ultra-low temperature co-fired microwave devices.

Keyword :

dielectric materials low temperature properties LTCC

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GB/T 7714 Zhang, Gao-qun , Guo, Jing , Wang, Hong . Ultra-low temperature sintering microwave dielectric ceramics based on Ag2O-MoO3 binary system [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2017 , 100 (6) : 2604-2611 .
MLA Zhang, Gao-qun et al. "Ultra-low temperature sintering microwave dielectric ceramics based on Ag2O-MoO3 binary system" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 100 . 6 (2017) : 2604-2611 .
APA Zhang, Gao-qun , Guo, Jing , Wang, Hong . Ultra-low temperature sintering microwave dielectric ceramics based on Ag2O-MoO3 binary system . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2017 , 100 (6) , 2604-2611 .
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High-Energy-Density Dielectric Polymer Nanocomposites with Trilayered Architecture EI SCIE Scopus
期刊论文 | 2017 , 27 (20) | ADVANCED FUNCTIONAL MATERIALS | IF: 13.325
WoS CC Cited Count: 41
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The development of advanced dielectric materials with high electric energy densities is of crucial importance in modern electronics and electric power systems. Here, a new class of multilayer-structured polymer nanocomposites with high energy and power densities is presented. The outer layers of the trilayered structure are composed of boron nitride nanosheets dispersed in poly(vinylidene fluoride) (PVDF) matrix to provide high breakdown strength, while PVDF with barium strontium titanate nanowires forms the central layer to offer high dielectric constant of the resulting composites. The influence of the filler contents on the electrical polarization, breakdown strength, and energy density is examined. Simulations are carried out to model the electrical tree formation in the layered nanocomposites and to verify the experimental breakdown results. The trilayered polymer nanocomposite with an optimized filler content displays a discharged energy density of 20.5 J cm(-3) at Weibull breakdown strength of 588 MV m(-1), which is among the highest discharged energy densities reported so far. Moreover, the nanocomposite exhibits a superior power density of 0.91 MW cm(-3), more than nine times that of the commercially available biaxially oriented polypropylene. The findings of this research provide a new design paradigm for high-performance dielectric polymer nanocomposites.

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GB/T 7714 Liu, Feihua , Li, Qi , Cui, Jin et al. High-Energy-Density Dielectric Polymer Nanocomposites with Trilayered Architecture [J]. | ADVANCED FUNCTIONAL MATERIALS , 2017 , 27 (20) .
MLA Liu, Feihua et al. "High-Energy-Density Dielectric Polymer Nanocomposites with Trilayered Architecture" . | ADVANCED FUNCTIONAL MATERIALS 27 . 20 (2017) .
APA Liu, Feihua , Li, Qi , Cui, Jin , Li, Zeyu , Yang, Guang , Liu, Yang et al. High-Energy-Density Dielectric Polymer Nanocomposites with Trilayered Architecture . | ADVANCED FUNCTIONAL MATERIALS , 2017 , 27 (20) .
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Ultrahigh Energy Storage Performance of Lead-Free Oxide Multilayer Film Capacitors via Interface Engineering EI SCIE PubMed Scopus
期刊论文 | 2017 , 29 (5) | ADVANCED MATERIALS | IF: 21.95
WoS CC Cited Count: 32
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Ultrahigh energy storage density of 52.4 J cm(-3) with optimistic efficiency of 72.3% is achieved by interface engineering of epitaxial lead-free oxide multi-layers at room temperature. Moreover, the excellent thermal stability of the performances provides solid basis for widespread applications of the thin film systems in modern electronic and power modules in harsh working environments.

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GB/T 7714 Sun, Zixiong , Ma, Chunrui , Liu, Ming et al. Ultrahigh Energy Storage Performance of Lead-Free Oxide Multilayer Film Capacitors via Interface Engineering [J]. | ADVANCED MATERIALS , 2017 , 29 (5) .
MLA Sun, Zixiong et al. "Ultrahigh Energy Storage Performance of Lead-Free Oxide Multilayer Film Capacitors via Interface Engineering" . | ADVANCED MATERIALS 29 . 5 (2017) .
APA Sun, Zixiong , Ma, Chunrui , Liu, Ming , Cui, Jin , Lu, Lu , Lu, Jiangbo et al. Ultrahigh Energy Storage Performance of Lead-Free Oxide Multilayer Film Capacitors via Interface Engineering . | ADVANCED MATERIALS , 2017 , 29 (5) .
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