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Journal articles on the topic 'Perovskites and fluorites'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Zyryanov, V. V., V. A. Sadykov, M. I. Ivanovskaya, J. M. Criado, and S. Neophytides. "Synthesis and sintering of ceramic nanocomposites with high mixed conductivity." Science of Sintering 37, no. 1 (2005): 45–54. http://dx.doi.org/10.2298/sos0501045z.

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Metastable solid solutions of complex oxides with fluorite and perovskite structures are obtained by mechanosynthesis. Dense ceramics on the base of these metastable phases was obtained by thermal sintering of nanopowders due to kinetic stabilization. Different degrees of a chemical interaction (interdiffusion) are observed during sintering of "perovskite+fluorite" and "perovskite+perovskite" composites. It is shown, that optimization of the composition, mixing conditions of individual phases and their sintering, preparation of ceramic composites with mixed conductivity for use in catalytic membrane reactors is possible. Unusual behavior of complex perovskites and fluorites is discovered during sintering, enabling determination of an optimum sintering temperature and time for which a qualitative explanation is given. It is established that rearrangement of fine crystalline particles as a whole plays a key role in shrinkage.

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2

Mitchell, Roger H., Mark D. Welch, and Anton R. Chakhmouradian. "Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition." Mineralogical Magazine 81, no. 3 (June 2017): 411–61. http://dx.doi.org/10.1180/minmag.2016.080.156.

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AbstractOn the basis of extensive studies of synthetic perovskite-structured compounds it is possible to derive a hierarchy of hettotype structures which are derivatives of the arisotypic cubic perovskite structure (ABX3), exemplified by SrTiO3 (tausonite) or KMgF3 (parascandolaite) by: (1) tilting and distortion of the BX6 octahedra; (2) ordering of A- and B-site cations; (3) formation of A-, B- or X-site vacancies. This hierarchical scheme can be applied to some naturally-occurring oxides, fluorides,hydroxides, chlorides, arsenides, intermetallic compounds and silicates which adopt such derivative crystal structures. Application of this hierarchical scheme to naturally-occurring minerals results in the recognition of a perovskite supergroup which is divided into stoichiometric and non-stoichiometricperovskite groups, with both groups further divided into single ABX3 or double A2BB'X6 perovskites. Subgroups, and potential subgroups, of stoichiometric perovskites include: (1) silicate single perovskites of the bridgmanite subgroup;(2) oxide single perovskites of the perovskite subgroup (tausonite, perovskite, loparite, lueshite, isolueshite, lakargiite, megawite); (3) oxide single perovskites of the macedonite subgroup which exhibit second order Jahn-Teller distortions (macedonite, barioperovskite); (4) fluoride singleperovskites of the neighborite subgroup (neighborite, parascandolaite); (5) chloride single perovskites of the chlorocalcite subgroup; (6) B-site cation ordered double fluoride perovskites of the cryolite subgroup (cryolite, elpasolite, simmonsite); (7) B-site cation orderedoxide double perovskites of the vapnikite subgroup [vapnikite, (?) latrappite]. Non-stoichiometric perovskites include: (1) A-site vacant double hydroxides, or hydroxide perovskites, belonging to the söhngeite, schoenfliesite and stottite subgroups; (2) Anion-deficient perovskitesof the brownmillerite subgroup (srebrodolskite, shulamitite); (3) A-site vacant quadruple perovskites (skutterudite subgroup); (4) B-site vacant single perovskites of the oskarssonite subgroup [oskarssonite]; (5) B-site vacant inverse single perovskites of the coheniteand auricupride subgroups; (6) B-site vacant double perovskites of the diaboleite subgroup; (7) anion-deficient partly-inverse B-site quadruple perovskites of the hematophanite subgroup.

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3

Zyryanov, V. V., N. F. Uvarov, V. A. Sadykov, G. M. Alikina, L. S. Ivashkevich, M. I. Ivanovskaya, and S. Neophytides. "Mechanochemical synthesis, structure, and properties of nanocrystalline metastable perovskites and fluorites for catalytic membrane reactors." Journal of Structural Chemistry 45, S1 (January 2004): S127—S132. http://dx.doi.org/10.1007/s10947-006-0107-0.

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4

Zyryanov, V. V. "Mechanism of mechanochemical synthesis of complex oxides and the peculiarities of their nano-structurization determining sintering." Science of Sintering 37, no. 2 (2005): 77–92. http://dx.doi.org/10.2298/sos0502077z.

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A mechanism of superfast mechanosynthesis reaction for oxide systems is proposed on the base of a dynamics study. The threshold effect and linear dependence of the chemical response on the effective temperature of the reaction zone are established. Major factors are determined: molecular mass of reagents, enthalpy and difference of reagents in Mohs?s hardness, which also influence the composition of the primary product. Primary acts are characterized by a superfast roller mechanism of mass transfer with the formation of a transient dynamic state (D)*. Secondary acts slowly approximate the composition of the product to the composition of the starting mixture by diffusion mass transfer in a deformation mixing regime with a contribution of a rotation (roller) mechanism. The list of structure types for complex oxides derived by mechanosynthesis includes perovskites, fluorites, pyrochlors, sheelites, and some other ones. Powders of crystal products display multilevel structurization. In all studied complex oxides strong disordering of the ?anti-glass? type was observed. The mechanism of sintering was studied in BaTiO3 powders of different origin and in metastable complex oxides derived by mechanosynthesis. The major contribution in shrinkage belongs to rearrangements of crystalline particles as a whole. Structure transformations accompany, as a rule, sintering of inhomogeneous powders derived by mechanosynthesis.

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5

Ye, Ziqing, Junmin Xia, Dengliang Zhang, Xingxing Duan, Zhaohui Xing, Guangrong Jin, Yongqing Cai, Guichuan Xing, Jiangshan Chen, and Dongge Ma. "Efficient Quasi-2D Perovskite Light-Emitting Diodes Enabled by Regulating Phase Distribution with a Fluorinated Organic Cation." Nanomaterials 12, no. 19 (October 6, 2022): 3495. http://dx.doi.org/10.3390/nano12193495.

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Metal halide perovskites have become a research highlight in the optoelectronic field due to their excellent properties. The perovskite light-emitting diodes (PeLEDs) have achieved great improvement in performance in recent years, and the construction of quasi-2D perovskites by incorporating large-size organic cations is an effective strategy for fabricating efficient PeLEDs. Here, we incorporate the fluorine meta-substituted phenethylammonium bromide (m-FPEABr) into CsPbBr3 to prepare quasi-2D perovskite films for efficient PeLEDs, and study the effect of fluorine substitution on regulating the crystallization kinetics and phase distribution of the quasi-2D perovskites. It is found that m-FPEABr allows the transformation of low-n phases to high-n phases during the annealing process, leading to the suppression of n = 1 phase and increasing higher-n phases with improved crystallinity. The rational phase distribution results in the formation of multiple quantum wells (MQWs) in the m-FPEABr based films. The carrier dynamics study reveals that the resultant MQWs enable rapid energy funneling from low-n phases to emission centers. As a result, the green PeLEDs achieve a peak external quantum efficiency of 16.66% at the luminance of 1279 cd m−2. Our study demonstrates that the fluorinated organic cations would provide a facile and effective approach to developing high-performance PeLEDs.

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6

Eglitis, Roberts I., Juris Purans, Anatoli I. Popov, and Ran Jia. "Tendencies in ABO3 Perovskite and SrF2, BaF2 and CaF2 Bulk and Surface F-Center Ab Initio Computations at High Symmetry Cubic Structure." Symmetry 13, no. 10 (October 12, 2021): 1920. http://dx.doi.org/10.3390/sym13101920.

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We computed the atomic shift sizes of the closest adjacent atoms adjoining the (001) surface F-center at ABO3 perovskites. They are significantly larger than the atomic shift sizes of the closest adjacent atoms adjoining the bulk F-center. In the ABO3 perovskite matrixes, the electron charge is significantly stronger confined in the interior of the bulk oxygen vacancy than in the interior of the (001) surface oxygen vacancy. The formation energy of the oxygen vacancy on the (001) surface is smaller than in the bulk. This microscopic energy distinction stimulates the oxygen vacancy segregation from the perovskite bulk to their (001) surfaces. The (001) surface F-center created defect level is nearer to the (001) surface conduction band (CB) bottom as the bulk F-center created defect level. On the contrary, the SrF2, BaF2 and CaF2 bulk and surface F-center charge is almost perfectly confined to the interior of the fluorine vacancy. The shift sizes of atoms adjoining the bulk and surface F-centers in SrF2, CaF2 and BaF2 matrixes are microscopic as compared to the case of ABO3 perovskites.

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7

Dong, Ningfei, Haosu Zhou, Lei Wang, and Zhihai Liu. "Electron Transport Layer-Free Ruddlesden–Popper Two-Dimensional Perovskite Solar Cells Enabled by Tuning the Work Function of Fluorine-Doped Tin Oxide Electrodes." Crystals 12, no. 8 (August 4, 2022): 1090. http://dx.doi.org/10.3390/cryst12081090.

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Organic–inorganic halide two-dimensional (2D) layered perovskites have been demonstrated to have better environmental stability than conventional three-dimensional perovskites. In this study, we investigate the fabrication of electron transport layer (ETL)-free Ruddlesden–Popper 2D perovskite solar cells (PSCs) by tuning the work function of a fluorine-doped tin oxide (FTO) electrode. With the deposition of polyethylenimine (PEIE) onto its surface, the work function of the FTO electrode could be raised from −4.72 to −4.08 eV, which is more suitable for electron extraction from the perovskite absorber. Using this technique, the ETL-free 2D PSCs exhibited an excellent power conversion efficiency (PCE) of 12.7% (on average), which is substantially higher than that of PSCs fabricated on a pristine FTO electrode (9.6%). Compared with the PSCs using TiO2, the ETL-free PSCs could be fabricated under a low processing temperature of 100 °C with excellent long-term stability. After 15 days, the FTO/PEIE-based ETL-free PSCs showed a PCE degradation of 16%, which is significantly lower than that of the TiO2-based case (29%). The best-performing PSC using a FTO/PEIE cathode showed a high PCE of 13.0%, with a small hysteresis degree of 2.3%.

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8

Black, Cameron, and Philip Lightfoot. "Crystal structure of guanidinium hexafluoridovanadate(III), (CN3H6)3[VF6]: an unusual hybrid compound related to perovskite." Acta Crystallographica Section C Structural Chemistry 73, no. 3 (February 6, 2017): 244–46. http://dx.doi.org/10.1107/s2053229617001711.

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Vanadium fluorides with novel crystal–chemical features and interesting physical properties can be prepared by solvothermal synthetic routes. The title compound, guanidinium hexafluoridovanadate(III), has a cubic structure (space group Pa\overline{3}), exhibiting isolated regular VF6 octahedral units, which are hydrogen bonded to protonated guanidinium moieties. Although the VF6 octahedral units are not linked directly together, there are structural similarities between this crystal structure and those of the wider family of perovskite materials, in particular, hybrid perovskites based on extended ligands such as cyanide. In this context, the octahedral tilt system of the present compound is of interest and demonstrates that unusual tilt systems can be mediated via `molecular' linkers which allow only supramolecular rather than covalent interactions.

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9

Kobayashi, Yoji, Yoshihiro Tsujimoto, and Hiroshi Kageyama. "Property Engineering in Perovskites via Modification of Anion Chemistry." Annual Review of Materials Research 48, no. 1 (July 2018): 303–26. http://dx.doi.org/10.1146/annurev-matsci-070317-124415.

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Perovskite-type oxides have proven to be a versatile class of compounds with systematic study of their structure and various properties. Further structural variations and properties can be added by adding a second anionic species other than oxide, such as hydride, fluoride, nitride, or others. The different charge, covalency, size, and new modes of local coordination offer convenient ways to further control carrier doping, magnetism, conductivity, and even chemical reactivity. In this review we examine the recent work concerning various mixed-anion perovskites and conclude with potential new directions for the further development of these materials.

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10

Wang, Yuan, Laipan Zhu, and Cuifeng Du. "Progress in Piezoelectric Nanogenerators Based on PVDF Composite Films." Micromachines 12, no. 11 (October 20, 2021): 1278. http://dx.doi.org/10.3390/mi12111278.

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In recent years, great progress has been made in the field of energy harvesting to satisfy increasing needs for portable, sustainable, and renewable energy. Among piezoelectric materials, poly(vinylidene fluoride) (PVDF) and its copolymers are the most promising materials for piezoelectric nanogenerators (PENGs) due to their unique electroactivity, high flexibility, good machinability, and long–term stability. So far, PVDF–based PENGs have made remarkable progress. In this paper, the effects of the existence of various nanofillers, including organic–inorganic lead halide perovskites, inorganic lead halide perovskites, perovskite–type oxides, semiconductor piezoelectric materials, two–dimensional layered materials, and ions, in PVDF and its copolymer structure on their piezoelectric response and energy–harvesting properties are reviewed. This review will enable researchers to understand the piezoelectric mechanisms of the PVDF–based composite–film PENGs, so as to effectively convert environmental mechanical stimulus into electrical energy, and finally realize self–powered sensors or high–performance power sources for electronic devices.

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11

Sławek, Andrzej, Zbigniew Starowicz, and Marek Lipiński. "The Influence of the Thickness of Compact TiO2 Electron Transport Layer on the Performance of Planar CH3NH3PbI3 Perovskite Solar Cells." Materials 14, no. 12 (June 14, 2021): 3295. http://dx.doi.org/10.3390/ma14123295.

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In recent years, lead halide perovskites have attracted considerable attention from the scientific community due to their exceptional properties and fast-growing enhancement for solar energy harvesting efficiency. One of the fundamental aspects of the architecture of perovskite-based solar cells (PSCs) is the electron transport layer (ETL), which also acts as a barrier for holes. In this work, the influence of compact TiO2 ETL on the performance of planar heterojunction solar cells based on CH3NH3PbI3 perovskite was investigated. ETLs were deposited on fluorine-doped tin oxide (FTO) substrates from a titanium diisopropoxide bis(acetylacetonate) precursor solution using the spin-coating method with changing precursor concentration and centrifugation speed. It was found that the thickness and continuity of ETLs, investigated between 0 and 124 nm, strongly affect the photovoltaic performance of PSCs, in particular short-circuit current density (JSC). Optical and topographic properties of the compact TiO2 layers were investigated as well.

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12

Parish, Chad M., Geoff L. Brennecka, Bruce A. Tuttle, and Luke N. Brewer. "Quantitative chemical analysis of fluorite-to-perovskite transformations in (Pb,La)(Zr,Ti)O3 PLZT thin films." Journal of Materials Research 23, no. 11 (November 2008): 2944–53. http://dx.doi.org/10.1557/jmr.2008.0353.

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Lead loss during processing of solution-derived Pb(Zr,Ti)O3 (PZT)-based thin-films can result in the formation of a Pb-deficient, nonferroelectric fluorite phase that is detrimental to dielectric properties. It has recently been shown that this nonferroelectric fluorite phase can be converted to the desired perovskite phase by postcrystallization treatment. Here, quantitative standard-based energy-dispersive x-ray spectrometry (EDS) in a scanning transmission electron microscope (STEM) is used to study cation distribution before and after this fluorite-to-perovskite transformation. Single-phase perovskite PbZr0.53Ti0.47O3 (PZT 53/47) and Pb0.88La0.12Zr0.68Ti0.29O3 (PLZT 12/70/30) specimens that underwent this treatment were found to be chemically indistinguishable from the perovskite present in the multiphase specimens prior to the fluorite-to-perovskite transformation. Significant Zr–Ti segregation is found in PLZT 12/70/30, but not in PZT 53/47. Slight La-segregation was seen in rapidly crystallized PLZT, but not in more slowly crystallized PLZT.

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13

Nkwachukwu, Oluchi V., Charles Muzenda, Babatope O. Ojo, Busisiwe N. Zwane, Babatunde A. Koiki, Benjamin O. Orimolade, Duduzile Nkosi, Nonhlangabezo Mabuba, and Omotayo A. Arotiba. "Photoelectrochemical Degradation of Organic Pollutants on a La3+ Doped BiFeO3 Perovskite." Catalysts 11, no. 9 (September 2, 2021): 1069. http://dx.doi.org/10.3390/catal11091069.

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Towards nonconventional wastewater treatment methods for the degradation of organic pollutants in wastewater, a perovskite-based photoelectrochemical system was developed. Bismuth ferrite doped with lanthanum (La-BiFeO3, La-BFO) perovskite was synthesised through a hydrothermal method with low calcination temperature for the photoelectrochemical degradation of orange II dye and other cocktails of dyes. Photoanodes were prepared by the deposition of the perovskites on a fluorine-doped tin oxide (FTO) substrate. The photoanodes were characterised using XRD, FESEM, FTIR and UV-vis diffuse reflectance. The photoelectrochemical properties of the synthesised photoanodes were investigated with chronoamperometry and electrochemical impedance spectroscopy (including Mott–Schottky analysis). The results show that all La3+-doped BFO photoanodes exhibited a higher absorption edge in the visible light region than the undoped BFO. The photocurrent response of 10% La-BFO (the best performing electrode) exhibited a three times higher current response than the pure BFO. In addition, the electrode exhibited a good degradation efficiency of 84.2% within 120 min with applied bias potential of 2 V at a pH of 7. EIS studies showed a significant enhancement of the interfacial electron transfer of the charge carriers. The enhancements in electrode performances were attributed to the synergistic effect of the applied bias potential and the introduction of La3+ into the BFO matrix. This study therefore shows that the photoelectrocatalytic performance of BFO for water treatment can be improved by the introduction of perovskites-doping ions such as La3+.

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14

Sadykov, Vladislav A., Vitaliy S. Muzykantov, Nikita F. Yeremeev, Vladimir V. Pelipenko, Ekaterina M. Sadovskaya, Alexey S. Bobin, Yulia E. Fedorova, Daiana G. Amanbaeva, and Alevtina L. Smirnova. "Solid Oxide Fuel Cell Cathodes: Importance of Chemical Composition and Morphology." Catalysis for Sustainable Energy 2, no. 1 (December 31, 2015): 57–70. http://dx.doi.org/10.1515/cse-2015-0004.

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AbstractThe main aspects of the cathode materials morphology for Intermediate Temperature Solid Oxide Fuel Cells (IT SOFC) are considered in this paper. The approaches for estimation of their basic properties, e.g. oxygen mobility and surface reactivity, are described and the results of different techniques (e.g. weight and conductivity relaxation, oxygen isotope exchange) application for studies of powders and dense ceramic materials are compared. The Ruddlesden-Popper type phases (e.g. Pr2NiO4) provide enhanced oxygen mobility due to cooperative mechanism of oxygen interstitial migration. For perovskites, the oxygen mobility is increased by doping, which generates oxygen vacancies or decreases metal-oxygen bond strength. Nonadditive increasing of the oxygen diffusion coefficients found that for perovskite-fluorite nanocomposites, it can be explained by the fast oxygen migration along perovskitefluorite interfaces. Functionally graded nanocomposite cathodes provide the highest power density, the lowest area specific polarization resistance, and the best stability to degradation caused by the surface layer carbonization/ hydroxylation, thus being the most promising for thin film IT SOFC design.

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15

Tuttle, B. A., T. J. Headley, H. N. Al-Shareef, J. A. Voigt, M. Rodriguez, J. Michael, and W. L. Warren. "Microstructure and 90° domain assemblages of Pb(Zr, Ti)O3//RuO2 capacitors as a function of Zr-to-Ti stoichiometry." Journal of Materials Research 11, no. 9 (September 1996): 2309–17. http://dx.doi.org/10.1557/jmr.1996.0294.

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Planar microstructure, 90° domain configurations, and cross-sectional perovskite grain morphology were characterized for a series of Pb(Zr, Ti)O3//RuO2 thin film capacitors. Perovskite grain size increased substantially with increasing Zr concentration of the Pb(Zr, Ti)O3 (PZT) films, being on the order of 0.15 μm for PZT 20/80 films and 2.5 μm for PZT 50/50 films. While PZT 20/80 and PZT 30/70 films were single phase perovskite, the PZT 40/60 and 50/50 films contained a second phase with fluorite structure. The second phase matrix consisted of two nanophases, one having fluorite structure while the other was amorphous. Both the amorphous nanophase and the fluorite nanophase were Pb deficient compared to the perovskite phase. Differences in cross-sectional perovskite grain morphology were substantial for these materials, with the PZT 40/60 film being almost entirely columnar and the PZT 20/80 film exhibiting almost entirely granular morphology. Differences in 90° domain wall density were essentially negligible among the films, suggesting that if 90° domains were responsible for the differences in electrical properties, it is not due to 90° domain population.

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16

Hwang, Ji Yong, II Tae Kim, and Hyung Wook Choi. "Characteristics of Perovskite Solar Cells with ZnGa2O4:Mn Phosphor Mixed Polyvinylidene Fluoride Down-Conversion Layer." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (June 1, 2021): 855–60. http://dx.doi.org/10.1166/jno.2021.3013.

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To reduce the manufacturing cost of perovskite solar cells, soda-lime glass and transparent conducting oxides such as indium tin oxide and fluorine-doped tin oxide are the most widely used substrates and lighttransmitting electrodes. However, the transmittance spectra of soda-lime glass, indium tin oxide, and fluorinedoped tin oxide show that all light near and below 330 nm is absorbed; thus, with the use of these substrates, light energy near and below 330 nm cannot reach the perovskite light-absorbing layer. It is expected that the overall solar cell can be improved if the wavelength can be adjusted to reach the perovskite solar cell absorbing layer through down-conversion of energy in the optical wavelength band. In this study, a polyvinylidene fluoride transparent film mixed with a ZnGa2O4:Mn phosphor was applied to the incident side of the perovskite solar cell with the intent to increase the light conversion efficiency without changing the internal bandgap energy and structure. By adding a phosphor layer to the external surface of PSC exposed to incident light, the efficiency of the cell was increased by the down-conversion of ultraviolet light (290 nm) to the visible region (509 nm) while maintaining the transmittance. To manufacture the perovskite solar cell, a TiO2-based mesoporous electron transport layer was spin-coated onto the substrate. The perovskite layer used in this experiment was CH3NH3PbI3 and was fabricated on a TiO2 layer. Spiro-OMeTAD solution was spin-coated as a hole-transport layer.

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17

Lindsay-Scott, Alex, David Dobson, Fabrizio Nestola, Matteo Alvaro, Nicola Casati, Christian Liebske, Kevin S. Knight, Ronald I. Smith, and Ian G. Wood. "Time-of-flight neutron powder diffraction with milligram samples: the crystal structures of NaCoF3and NaNiF3post-perovskites." Journal of Applied Crystallography 47, no. 6 (November 18, 2014): 1939–47. http://dx.doi.org/10.1107/s1600576714021803.

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Using the recently upgraded Polaris diffractometer at the ISIS Spallation Neutron Source (Rutherford Appleton Laboratory), the crystal structures of the post-perovskite polymorphs of NaCoF3and NaNiF3have been determined by time-of-flight neutron powder diffraction from samples, of mass 56 and 16 mg, respectively, recovered after synthesis at ∼20 GPa in a multi-anvil press. The structure of post-perovskite NaNiF3has also been determined by single-crystal synchrotron X-ray diffraction for comparison. All measurements were made at atmospheric pressure and room temperature. Despite the extremely small sample size in the neutron diffraction study, there is very good agreement between the positional parameters for NaNiF3obtained from the refinements of the X-ray and neutron data. Relative to the commonly used oxide post-perovskite analogue phases having calcium as theAcation, the axial ratios and derived structural parameters of these fluoride post-perovskites are more consistent with those of Mg0.91Fe0.09SiO3at high pressure and temperature. The structures of NaCoF3and NaNiF3are very similar, but the unit-cell and CoF6octahedral volumes of NaCoF3are larger than the corresponding quantities in NaNiF3, which supports the hypothesis that the Co2+ion has a high-spin state in this compound. The anisotropic atomic displacement parameters of the Na ions in NaNiF3post-perovskite are of similar magnitude to those of the F ions. The probability ellipsoid of the F1 ion is a prolate spheroid with its largest component parallel to thebaxis of the unit cell, corresponding to rotational motion of the NiF6octahedra about theaaxis of the crystal. Although they must be synthesized at pressures above about 18 GPa, theseABF3compounds are strongly metastable at atmospheric pressure and room temperature and so are highly suitable for use as analogues for (Mg,Fe)SiO3post-perovskite in the deep Earth, with significant advantages over oxides such as CaIrO3or CaPtO3.

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Jia, Ziyang, Wei Shi, Rui Ding, Wujiang Yu, Yi Li, Caini Tan, Xiujuan Sun, and Enhui Liu. "Conversion-type NiCoMn triple perovskite fluorides for advanced aqueous supercapacitors, batteries and supercapatteries." Chemical Communications 57, no. 64 (2021): 7962–65. http://dx.doi.org/10.1039/d1cc02488d.

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19

Eméry, J. "Covalency in fluoride perovskites." Journal of Fluorine Chemistry 35, no. 1 (February 1987): 190–91. http://dx.doi.org/10.1016/0022-1139(87)95151-7.

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20

Rittenmyer, K., A. S. Bhalla, and L. E. Cross. "Electrostriction in fluoride perovskites." Materials Letters 7, no. 11 (February 1989): 380–84. http://dx.doi.org/10.1016/0167-577x(89)90075-x.

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Shi, Wei, Wujiang Yu, Rui Ding, Ziyang Jia, Yi Li, Yuxi Huang, Caini Tan, Xiujuan Sun, and Enhui Liu. "Bipolar redox electrolyte-synergistically mediated NiCoMn-811 high-Ni ternary perovskite fluorides for advanced supercapacitors in both alkaline and neutral media." Journal of Materials Chemistry A 9, no. 15 (2021): 9624–33. http://dx.doi.org/10.1039/d1ta01156a.

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22

Filalli, Sihem, and Noura Hamdad. "Electro-Magnetic Behavior of Highly Correlated Fluorides KFeF3, KCoF3 and KNiF3: A Comparative Ab-initio Study of Cation Effect." Annals of West University of Timisoara - Physics 62, no. 1 (December 1, 2020): 23–51. http://dx.doi.org/10.2478/awutp-2020-0003.

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AbstractFluorides-based perovskites are currently the typical materials being used in spintronic devices, optoelectronic and magneto-resistance colossal fields. Solar cells made of Fluoro-perovskite hold much promise for the future of solar energy. The electronic structure and magnetic properties of KFeF3, KCoF3 and KNiF3 Fluorides are studied using ab initio Calculation. We have analysed the structural phases, total and partial electronic densities and band structures within the (DFT) vs the DFT+U description. We show the Electro-Magnetic Behavior using L(S)DA+U vs L(S)DA in a comparative study of cation effect by integrating three types of crystal structures (Cubic (Pm-3m), Four-Layered Hexagonal (P6/mmc), and Orthorhombic (Pnma)). Equilibrium lattices agree very well with experimental and theoretical data. Magnetic moment of each phase is discussed. The obtained results confirmed that the three crystal structures invested here exhibit Ferromagnetic (FM) behavior. The introduction of the Hubbard’s parameter U increases lattice parameters and magnetic moment. We deduce that the second cation plays an important role in the magnetic effects. L(S)DA+U show correctly that KFeF3, KCoF3 and KNiF3 are insulators.

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Ying, Danfeng, Rui Ding, Yongfa Huang, Wei Shi, Qilei Xu, Caini Tan, Xiujuan Sun, Ping Gao, and Enhui Liu. "Conversion pseudocapacitance-contributing and robust hetero-nanostructural perovskite KCo0.54Mn0.46F3 nanocrystals anchored on graphene nanosheet anodes for advanced lithium-ion capacitors, batteries and their hybrids." Journal of Materials Chemistry A 7, no. 31 (2019): 18257–66. http://dx.doi.org/10.1039/c9ta06438a.

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24

Chikamatsu, Akira, Keisuke Kawahara, Takaaki Shiina, Tomoya Onozuka, Tsukasa Katayama, and Tetsuya Hasegawa. "Fabrication of Fluorite-Type Fluoride Ba0.5Bi0.5F2.5 Thin Films by Fluorination of Perovskite BaBiO3 Precursors with Poly(vinylidene fluoride)." ACS Omega 3, no. 10 (October 12, 2018): 13141–45. http://dx.doi.org/10.1021/acsomega.8b02252.

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25

Ghanem, Mohamed A., Mabrook S. Amer, Abdullah M. Al-Mayouf, Prabhakarn Arunachalam, and Mark T. Weller. "Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution." Catalysts 11, no. 11 (November 20, 2021): 1408. http://dx.doi.org/10.3390/catal11111408.

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Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr2CoO4-xHx (H = F, Cl, and Br; x = 0 and 1) were prepared using a solid-phase synthesis approach and comparatively evaluated as electrocatalysts for oxygen evolution in an alkaline solution. The perovskite electrocatalyst crystal phase, surface morphology, and composition were examined by X-ray diffraction, a scanning electron microscope, and energy-dispersive X-ray (EDX) mapping. The electrochemical investigations of the oxyhalides catalysts showed that the doping of F, Cl, or Br into the Sr2CoO4 parent oxide enhances the electrocatalytic activity for the oxygen evolution reaction (OER) with the onset potential as well as the potential required to achieve a current density of 10 mA/cm2 shifting to lower potential values in the order of Sr2CoO4 (1.64, 1.73) > Sr2CoO3Br (1.61, 1.65) > Sr2CoO3Cl (1.53, 1.60) > Sr2CoO3F (1.50, 1.56) V vs. HRE which indicates that Sr2CoO3F is the most active electrode among the studied catalysts under static and steady-state conditions. Moreover, Sr2CoO3F demonstrates long-term stability and remarkably less charge transfer resistance (Rct = 36.8 ohm) than the other oxyhalide counterparts during the OER. The doping of the perovskites with halide ions particularly the fluoride-ion enhances the surface oxygen vacancy density due to electron withdrawal away from the Co-atom which improves the ionic and electronic conductivity as well as the electrochemical activity of the oxygen evolution in alkaline solution.

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26

Dobson, David P., Simon A. Hunt, Alexander Lindsay-Scott, and Ian G. Wood. "Towards better analogues for MgSiO3 post-perovskite: NaCoF3 and NaNiF3, two new recoverable fluoride post-perovskites." Physics of the Earth and Planetary Interiors 189, no. 3-4 (December 2011): 171–75. http://dx.doi.org/10.1016/j.pepi.2011.08.010.

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27

Bail, A. Le. "The anion-excess fluorite structure of β-Pb1−xFexF2+x(0.25 ≤ x ≤ 0.27)." Powder Diffraction 26, no. 4 (December 2011): 303–7. http://dx.doi.org/10.1154/1.3659491.

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The fluorite-related anion-excess β-Pb1−xFexF2+x (0.25 ≤ x ≤ 0.27) orthorhombic crystal structure is approached from powder diffraction data. A 1 × 1 × 2 fluorite supercell is found to describe the main aspects of the structure, which would have ideally the Pb3FeF9 formula (x = 0.25) (space group Cmmm, a = 5.9926(1), b = 5.5781(1), c = 11.5208(3) Å), and would include a complete [FeF4]∝−1 perovskite plane, orthogonal to the c axis. However, there is large Pb substitution (44%) on the perovskite Fe site as well as Fe substitution (∼25%) on one of the two main Pb sites. A strong relationship with the fully ordered crystal structure of Pb8MnFe2F24, which can be expressed as Pb1−xMxF2+2/3x (x = 0.273), is discussed, suggesting that both phases may have infinite [M3F14]∝ ribbons in common.

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28

Seol, Kwang Soo, Hironao Hiramatsu, Yoshimichi Ohki, In-Hoon Choi, and Yong-Tea Kim. "Low-temperature crystallization induced by excimer laser irradiation of SrBi2Ta2O9 films." Journal of Materials Research 16, no. 7 (July 2001): 1883–86. http://dx.doi.org/10.1557/jmr.2001.0257.

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Transition of a SrBi2Ta2O9 precursor film from amorphous to crystalline was inducedby excimer laser irradiation. Both fluorite and perovskite crystalline structures in suchfilms were obtained by excimer laser irradiation at substrate temperatures between 200and 500 °C. Either an addition of excess bismuth in the precursor film or an increasein the substrate temperature enhanced the formation of the perovskite structure in theexcimer laser-induced annealing process, resulting in the perovskite crystalline phase ata relatively lower temperature of 500 °C. Such a low temperature is preferred whenSrBi2Ta2O9 is used in ferroelectric devices. The mechanism involved in thislaser-induced crystallization is also discussed.

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29

Li, Teng, Rebecca Clulow, Alasdair J. Bradford, Stephen L. Lee, Alexandra M. Z. Slawin, and Philip Lightfoot. "A hybrid fluoride layered perovskite, (enH2)MnF4." Dalton Transactions 48, no. 15 (2019): 4784–87. http://dx.doi.org/10.1039/c9dt00757a.

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30

Wu, Jiao, Bo Wang, Zhiyuan Liu, Kang Zhang, Xiaoshuang Li, Jianhui Huang, Pengfei Liu, and Qingguang Zeng. "A novel Mn4+-activated layered oxide-fluoride perovskite-type KNaMoO2F4 red phosphor for wide gamut warm white light-emitting diode backlights." Dalton Transactions 50, no. 32 (2021): 11189–96. http://dx.doi.org/10.1039/d1dt01863a.

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31

Zanetti, S. M., E. R. Leite, E. Longo, and J. A. Varela. "Preparation and characterization of SrBi2Nb2O9 thin films made by polymeric precursors." Journal of Materials Research 13, no. 10 (October 1998): 2932–35. http://dx.doi.org/10.1557/jmr.1998.0400.

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A polymeric precursor solution was employed in preparing SrBi2Nb2O9 (SBN) powder and thin films dip coated onto Si(100) substrate. XRD results show that the SBN perovskite phase forms at temperatures as low as 600 °C through an intermediate fluorite phase. This fluorite phase is observed for samples heat-treated at temperatures of 400 and 500 °C. After heat treatment at temperatures ranging from 300 to 800 °C, thin films were shown to be crack free. Grazing incident angle XRD characterization shows the occurrence of the fluorite intermediate phase for films also. The thickness of films, measured by MEV, was in the order of 80–100 nm.

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32

Prasad, Beesabathina D., L. Salamanca-Riba, S. N. Mao, X. X. Xi, T. Venkatesan, and X. D. Wu. "Effect of substrate materials on laser deposited Nd1.85Ce0.15CuO4−y films." Journal of Materials Research 9, no. 6 (June 1994): 1376–83. http://dx.doi.org/10.1557/jmr.1994.1376.

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The growth morphology and interface structure of Nd1.85Ce0.15CuO4−y (NCCO) films grown by pulsed laser deposition on two different types of substrates, “perovskite” LaAlO3 (LAO) and SrTiO3 (STO) and “fluorite” Y2O3-stabilized ZrO2 (YSZ), were studied using cross-sectional electron microscopy. Structurally, the NCCO films are different when grown on the two types of substrates in three aspects: (i) epitaxy, (ii) substrate-film intermixing, and (iii) substrate-film interface roughness. In general, films deposited on “fluorite” substrates showed better superconducting properties than the films grown on “perovskite” substrates, especially for thinner films. Lattice mismatch considerations are not sufficient to explain the observed differences since films grown on the YSZ substrate showed sharp substrate-film interface in spite of their large lattice misfit. The atomic arrangements at the interface were analyzed in terms of electrostatic energy (charge balance) and matching of the oxygen sublattices in order to account for the experimental results.

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33

Pascual, Jorge, Marion Flatken, Roberto Félix, Guixiang Li, Silver‐Hamill Turren‐Cruz, Mahmoud H. Aldamasy, Claudia Hartmann, et al. "Fluoride Chemistry in Tin Halide Perovskites." Angewandte Chemie International Edition 60, no. 39 (July 24, 2021): 21583–91. http://dx.doi.org/10.1002/anie.202107599.

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34

Watson, G. W., S. C. Parker, and A. Wall. "Molecular dynamics simulation of fluoride-perovskites." Journal of Physics: Condensed Matter 4, no. 8 (February 24, 1992): 2097–108. http://dx.doi.org/10.1088/0953-8984/4/8/023.

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35

Tan, Caini, Rui Ding, Yuxi Huang, Tong Yan, Yongfa Huang, Feng Yang, Xiujuan Sun, Ping Gao, and Enhui Liu. "A vacancy-rich perovskite fluoride K0.79Ni0.25Co0.36Mn0.39F2.83@rGO anode for advanced Na-based dual-ion batteries." Chemical Communications 57, no. 47 (2021): 5830–33. http://dx.doi.org/10.1039/d1cc01477c.

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36

Afzaal, Mohammad, Heather M. Yates, Arnaud Walter, Sylvain Nicolay, and Christophe Ballif. "1 cm2 CH3NH3PbI3 mesoporous solar cells with 17.8% steady-state efficiency by tailoring front FTO electrodes." Journal of Materials Chemistry C 5, no. 20 (2017): 4946–50. http://dx.doi.org/10.1039/c7tc01248a.

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37

Deng, T. T., E. H. Song, Y. Y. Zhou, L. Y. Wang, and Q. Y. Zhang. "Tailoring photoluminescence stability in double perovskite red phosphors A2BAlF6:Mn4+(A = Rb, Cs; B = K, Rb)vianeighboring-cation modulation." Journal of Materials Chemistry C 5, no. 47 (2017): 12422–29. http://dx.doi.org/10.1039/c7tc04411a.

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We have effectively driven the photoluminescence stability in water tolerance and anti-thermal quenching behavior in double perovskite fluorides A₂BAlF₆:Mn⁴⁺(A = Rb, Cs; B = K, Rb)viamodulating the neighboring cation on the A-site or B-site.

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38

Sadykov, Vladislav, Ekaterina Sadovskaya, Nikita Eremeev, Elena Pikalova, Nina Bogdanovich, Elena Filonova, Yulia Fedorova, Alexey Krasnov, Pavel Skriabin, and Anton Lukashevich. "Design of materials for solid oxide fuel cells cathodes and oxygen separation membranes based on fundamental studies of their oxygen mobility and surface reactivity." E3S Web of Conferences 116 (2019): 00068. http://dx.doi.org/10.1051/e3sconf/201911600068.

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Design of materials for solid oxide fuel cells cathodes and oxygen separation membranes and studying their oxygen transport characteristics are important problems of modern hydrogen energy. In the current work, fundamentals of such materials design based on characterization of their oxygen mobility by oxygen isotope exchange with C18O2 and 18O2 in flow and closed reactors for samples of Ruddlesden – Popper-type oxides Ln2-xCaxNiO4+δ, perovskite-fluorite nanocomposites PrNi0.5Co0.5O3-δ – Ce0.9Y0.1O2-δ, etc. are presented. Fast oxygen transport was demonstrated for PNC – YDC (DO ~10-8 cm2/s at 700°C) nanocomposites due to domination of the fast diffusion channel involving oxygen of the fluorite phase with incorporated Pr cations and developed perovskite-fluorite interfaces. For LnCNO materials a high oxygen mobility (DO ~10-7 cm2/s at 700°C) provided by the cooperative mechanism of its migration was demonstrated. Depending on Ca dopant content and Ln cation nature, in some cases 1–2 additional channels of the slow diffusion appear due to decreasing the interstitial oxygen content and increasing the energy barrier for oxygen jumps due to cationic size effect. Optimized by the chemical composition and nanodomain structure materials of these types demonstrated a high performance as SOFC cathodes and functional layers in asymmetric supported oxygen separation membranes.

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39

Chen, Daqin, Yue Liu, Changbin Yang, Jiasong Zhong, Su Zhou, Jiangkun Chen, and Hai Huang. "Promoting photoluminescence quantum yields of glass-stabilized CsPbX3 (X = Cl, Br, I) perovskite quantum dots through fluorine doping." Nanoscale 11, no. 37 (2019): 17216–21. http://dx.doi.org/10.1039/c9nr07307h.

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40

Huang, Yongfa, Rui Ding, Danfeng Ying, Yuxi Huang, Caini Tan, Tong Yan, Xiujuan Sun, and Enhui Liu. "A F-deficient and high-Mn ternary perovskite fluoride anode with a dominant conversion mechanism for advanced Li-ion batteries." Chemical Communications 57, no. 62 (2021): 7705–8. http://dx.doi.org/10.1039/d1cc00910a.

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41

Fang, Wei, Tianrang Yang, and Kevin Huang. "In situ synthesis of a high-performance bismuth oxide based composite cathode for low temperature solid oxide fuel cells." Chemical Communications 55, no. 19 (2019): 2801–4. http://dx.doi.org/10.1039/c9cc00442d.

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A composite cathode consisting of fluorite (Bi_0.75Y_0.25)_0.93Ce_0.07O_1.5±δ and perovskite La_0.8Sr_0.2MnO₃ is synthesized by in situ single-step phase formation and microstructure assembly.

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42

Burkitt, Daniel, Justin Searle, and Trystan Watson. "Perovskite solar cells in N-I-P structure with four slot-die-coated layers." Royal Society Open Science 5, no. 5 (May 2018): 172158. http://dx.doi.org/10.1098/rsos.172158.

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The fabrication of perovskite solar cells in an N-I-P structure with compact titanium dioxide blocking, mesoporous titanium dioxide scaffold, single-step perovskite and hole-transport layers deposited using the slot-die coating technique is reported. Devices on fluorine-doped tin oxide-coated glass substrates with evaporated gold top contacts and four slot-die-coated layers are demonstrated, and best cells reach stabilized power conversion efficiencies of 7%. This work demonstrates the suitability of slot-die coating for the production of layers within this perovskite solar cell stack and the potential to transfer to large area and roll-to-roll manufacturing processes.

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43

Talantikite-Touati, Djahida, and Laldja Benzïada. "Preparation and Characterization of New Oxyfluoride Phases (Ba,Na)(Ti,Mg)(O,F)." Advances in Science and Technology 62 (October 2010): 101–6. http://dx.doi.org/10.4028/www.scientific.net/ast.62.101.

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Oxyfluoride phases have been synthesized in free atmosphere, using the initially synthesized perovskite BaTiO3 and the fluorides NaF and MgF2. The purity of BaTiO3 and oxyfluorides has been checked by X–Ray diffraction (XRD).The microstructures of these phases are observed by scanning electron microscopy. The phase transitions have been investigated by dielectric measurements and differential scanning calorimetry (DSC).

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44

Sun, Qiang, Cai Shen, Deyu Wang, Tao Zhang, Huaxia Ban, Yan Shen, Zhipan Zhang, Xiao-Li Zhang, Guanjun Yang, and Mingkui Wang. "Efficient and Stable Large-Area Perovskite Solar Cells with Inorganic Perovskite/Carbon Quantum Dot-Graded Heterojunction." Research 2021 (July 12, 2021): 1–10. http://dx.doi.org/10.34133/2021/9845067.

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This work reports on a compositionally graded heterojunction for photovoltaic application by cooperating fluorine-doped carbon quantum dots (FCQDs in short) into the CsPbI2.5Br0.5 inorganic perovskite layer. Using this CsPbI2.5Br0.5/FCQDs graded heterojunction in conjunction with low-temperature-processed carbon electrode, a power conversion efficiency of 13.53% for 1 cm2 all-inorganic perovskite solar cell can be achieved at AM 1.5G solar irradiation. To the best of our knowledge, this is one of the highest efficiency reported for carbon electrode based all-inorganic perovskite solar cells so far, and the first report of 1 cm2 carbon counter electrode based inorganic perovskite solar cell with PCE exceeding 13%. Moreover, the inorganic perovskite/carbon quantum dot graded heterojunction photovoltaics maintained over 90% of their initial efficiency after thermal aging at 85° for 1056 hours. This conception of constructing inorganic perovskite/FCQDs graded heterojunction offers a feasible pathway to develop efficient and stable photovoltaics for scale-up and practical applications.

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45

Akaogi, Masaki, Yuichi Shirako, Hiroshi Kojitani, Takayuki Nagakari, Hitoshi Yusa, and Kazunari Yamaura. "High-pressure transitions in NaZnF3 and NaMnF3 perovskites, and crystal-chemical characteristics of perovskite–postperovskite transitions in ABX3 fluorides and oxides." Physics of the Earth and Planetary Interiors 228 (March 2014): 160–69. http://dx.doi.org/10.1016/j.pepi.2013.09.001.

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46

Gao, Yuanji, Xiangxiang Feng, Jianhui Chang, Caoyu Long, Yang Ding, Hengyue Li, Keqing Huang, Biao Liu, and Junliang Yang. "Surface ion exchange and targeted passivation with cesium fluoride for enhancing the efficiency and stability of perovskite solar cells." Applied Physics Letters 121, no. 7 (August 15, 2022): 073902. http://dx.doi.org/10.1063/5.0097939.

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Interfacial defects greatly influence the performance of perovskite solar cells (PSCs), and interface engineering is a powerful technique to promote the power conversion efficiency (PCE) of PSCs. Herein, an interfacial passivation strategy is developed employing cesium fluoride (CsF) to modify the surface of a perovskite film. Theoretical calculations suggest that the Cs+ and F− ions have a targeted passivation effect to decrease the defect density of the perovskite. Meanwhile, Cs+-formamidine+ (FA+) and F−–I− ion exchange can occur on the perovskite surface, which leads to the decline of the Fermi level of perovskite and reinforces the built-in potential of PSCs. Additionally, experiment results also confirm the reduction in the interfacial defects and the enhancement of the built-in potential. Consequently, the open-circuit voltage ( Voc) of PSCs is increased from 1.07 to 1.12 V, contributing to the promotion of the PCE. Furthermore, the stability of PSCs is obviously improved as well owing to the suppressed phase transition of α-phase perovskite. Our findings provide guidelines for surface modification of perovskite crystals to enhance the performance and stability of PSCs.

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47

Lizzo, S., A. Meijerink, G. J. Dirksen, and G. Blasse. "Luminescence of Cu+ in some fluoride perovskites." Chemical Physics Letters 253, no. 1-2 (April 1996): 108–12. http://dx.doi.org/10.1016/0009-2614(96)00216-3.

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48

Yuan, Long, Lei Ge, Xiaoli Sun, Jiaqi Zhang, Jie Yu, Chenyang Zhang, and Haibo Li. "Hydrothermal growth of facet-tunable fluoride perovskite crystals KMF3 (M = Mg, Mn, Co, Ni and Zn)." CrystEngComm 22, no. 37 (2020): 6216–27. http://dx.doi.org/10.1039/d0ce00807a.

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A family of perovskite structure fluoride (KMF₃, M = Mg, Mn, Co, Ni, and Zn) single crystals has been grown with tuneable exposed facets via ligand substitution strategy in mild hydrothermal condition.

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49

Sabri, Nasehah Syamin, Chi Chin Yap, Muhammad Yahaya, Muhamad Mat Salleh, and Mohammad Hafizuddin Haji Jumali. "Effects of CH₃NH₃PbI_(3-x)Cl_x Perovskite Layer on the Performance of Inverted Type Hybrid Organic Solar Cells Based on ZnO/P3HT." Materials Science Forum 846 (March 2016): 292–97. http://dx.doi.org/10.4028/www.scientific.net/msf.846.292.

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This paper reports the effect of perovskite layer on enhancing the inverted type hybrid organic solar cell performance. The mixtures of methylammonium iodide (CH3NH3I) and lead (II) chloride (PbCl2) were dissolved in N,N-Dimethylformamide (DMF) solvent and was spin-coated onto fluorine-doped tin oxide (FTO) glass substrate coated with zinc oxide nanorod arrays (ZnONRAs). The poly (3-hexylthiophene-2,5-diyl) (P3HT) film was then spin-coated onto CH3NH3I(3-x)PbClx perovskite layer, followed by silver (Ag) deposition using magnetron sputtering technique. The FTO/ZnO seed/ZnONRAs/CH3NH3PbI(3-x)Clx /P3HT/Ag device was fabricated. A device without perovskite layer was also fabricated for comparison. A power conversion efficiency (PCE) of 0.56% was achieved with the introduction of perovskite layer. The PCE was approximately six times greater than the device without perovskite layer, as a result of wider light absorption range and higher exciton dissociation efficiency.

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50

Quilty, Calvin D., Maxim Avdeev, Jeremy D. Driskell, and Eirin Sullivan. "Structural characterization and photoluminescence in the rare earth-free oxy-fluoride anti-perovskites Sr3−xBi2x/3AlO4F and Sr3−xBi2x/3GaO4F." Dalton Transactions 46, no. 12 (2017): 4055–65. http://dx.doi.org/10.1039/c7dt00310b.

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The oxy-fluoride anti-perovskites Sr_3−xBi_2x/3AlO₄F and Sr_3−xBi_2x/3GaO₄F form rare earth-free phosphors where Bi³⁺ions preferentially occupy the ten coordinate Sr(1) site.

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