Increase of Voc using heterojunctions of BaTiO3 without sensitization

Lilge, Tatiane Strelow; Stigger, Ananda Ramires das Neves; Fernandes, Cristian Dias; Gularte, Luciano Timm; Raubach, Cristiane W.; Cava, Sergio; Jardim, Pedro Lovato Gomes; Valério, Mário E.G.; Moreira, Mário L.

doi:10.1016/j.ceramint.2019.10.227

Cited by 25 publications

(12 citation statements)

References 48 publications

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“…This was confirmed by the surface area data, where Nb 2 O 5 _CR and Nb 2 O 5 _SG had the highest values. The smaller size of the nanoparticles favors the attainment of a more homogeneous layer, thus reducing the recombination processes in the DSSC photoanode [11]. Therefore, the number of potential barriers was not relevant, and the effects of dye adhesion and electron transfer from the electrolyte predominated.…”

Section: Resultsmentioning

confidence: 99%

“…The DSSC assembly was performed in different steps. First, for the photoanode, the conductive glass substrate FTO (fluorine-doped tin oxide, 7 X sq -1 , Sigma-Aldrich) was cleaned as previously described [11,24]. Nb 2 O 5 pastes were prepared using 300 mg of Nb 2 O 5 from each synthesis (CR, SG, PP, MAH), 18 lL of ethylene glycol, 15 lL of Triton-X, and an amount of ethanol between 75 and 150 lL.…”

Section: Dssc Assemblymentioning

confidence: 99%

“…These solar cells generally use a photoanode, a counter electrode, and an electrolyte in a regenerative photoelectrochemical process [6][7][8][9]. The photoanode, a fundamental component in the manufacture of DSSCs, is a layer made with an inorganic semiconductor material sensitized by an organic dye [10,11].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

et al. 2021

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The performance of niobium pentoxide (Nb 2 O 5 ) as photoanodes in dye-sensitized solar cells (DSSCs) and as catalysts in the photocatalytic degradation of Rhodamine B (RhB) was investigated. Four samples of Nb 2 O 5 (Nb 2 O 5 _SG, Nb 2 O 5 _CR, Nb 2 O 5 _PP, and Nb 2 O 5 _MA) were synthesized by four different methods, respectively, entailing the sol-gel, combustion, polymeric precursors, and a microwave-assisted hydrothermal reaction. In all these samples, the orthorhombic phase of Nb 2 O 5 was obtained, which resulted in different shapes and assemblies, which is very relevant because the surface area, shape, and size distribution of the nanoparticles significantly contribute to the optical process. The bandgap remained constant at 3.0 eV for all the samples, even for the sample prepared by the combustion method. An additional phase, which is related to local distortions, was revealed by Raman spectroscopy within the vibration range of 688-260 cm -1 . DSSCs using photoanodes with smaller and more dispersed Nb 2 O 5 particles showed better results than those with inhomogeneities. For comparison, DSSCs were assembled using two different counter electrodes, platinum and graphite. The DSSC with platinum showed better photovoltaic results, mainly with photocurrents from 1.17 mA.cm -2 for Nb 2 O 5 _CR to 1.64 mA.cm -2 for Nb 2 O 5 _SG. The same trend was observed for the photocatalytic degradation of RhB, where the smaller and dispersed particles of Nb 2 O 5 _CR and Nb 2 O 5 _SG exhibited the best performance and, respectively, degraded approximately 75% and 61% of the RhB dye over 180 min. Therefore, the results of this study established a correlation between the synthesis methods and photonic behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Dssc Assemblymentioning

confidence: 99%

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Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

et al. 2021

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“…The schematic model is similar to that used by other researchers, as found in the literature. [60][61][62][63][64] 2.1.5 Characterization. The structural phase and crystallinity level of the samples were identified by X-ray diffraction (XRD) using a Rigaku diffractometer with Cu-Ka radiation from 20 to 1001 with a 0.021 step width and a scanning rate of 5 s to each point.…”

Section: Synthesis Of Zns Particlesmentioning

confidence: 99%

Low recombination rates and improving charge transfer as decisive conditions for high current densities and fill factors in ZnS complex systems

Fernandes

Ferrer

Raubach

et al. 2022

Phys. Chem. Chem. Phys.

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“…Its crystal structure can undergo various changes from tetragonal to cubic above its Curie temperature (Tc = 130°C) [10]. The tetragonal phase is related to the emergence of ferroelectric properties in the structure while the cubic phase shows pyroelectric characteristics [11]. The crystal structure and functional properties of this material are strongly influenced by the synthesis process [12].…”

Section: Introductionmentioning

confidence: 99%

Impacts of low sintering temperature on microstructure, atomic bonds, and dielectric constant of barium titanate (BaTiO3) prepared by co-precipitation technique

Suherman

Nurosyid

Khairuddin

et al. 2022

J. Phys.: Conf. Ser.

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Barium Titanate (BaTiO3 or BT) is one of which the most attractive ferroelectric materials that have been widely studied. The fabrication process affects the properties of ferroelectric materials where increasing the sintering temperature is one of the ways to improve their performance. In this study, BT has been synthesized using the co-precipitation technique. The samples were sintered for 4 h with varying sintering temperatures of 700°C and 800°C. The purpose of this study was to investigate the effects of variation of sintering temperatures on the microstructure, dielectric constant, and chemical bonds of BT. The micro structure observed by the X-Ray Diffraction (XRD) showed that the crystal size of the sample at 800°C was larger than the sample at 700°C. Furthermore, the Fourier Transform Infrared (FTIR) analysis revealed that increasing the sintering temperature decreased the intensity of the impurities’ peaks of C-H and C=O atomic bonds in the BT structure. The impurity that appear is the carbonate phase which does not decompose during the formation of BT. Moreover, based on the Resistance Capacitance Inductance (RCL Meter) examination, increasing the sintering temperatures could enhance the dielectric constant of the BT samples from 65 to 162. Thus, it can be inferred, that the increase in the sintering temperature could improve the crystal structure and decrease the impurities phases of the BT materials so that further could enhance the dielectric constant.

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Increase of Voc using heterojunctions of BaTiO3 without sensitization

Cited by 25 publications

References 48 publications

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

Low recombination rates and improving charge transfer as decisive conditions for high current densities and fill factors in ZnS complex systems

Impacts of low sintering temperature on microstructure, atomic bonds, and dielectric constant of barium titanate (BaTiO3) prepared by co-precipitation technique

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