Search results for "Niobium pentoxide"

showing 2 items of 2 documents

Physical and Chemical Principles of Obtaining Thermally Resistant Containers for Treatment of High Purity Niobium and Tantalum Compounds

2011

Mathematical modelling of the distribution of strain in layered quartz ceramics with protective coating of niobium (tantalum) pentoxide from two sides is reported. It is found that fragmentation of the basic layer (decreasing the area of the continuous boarder between layers) and smoothing of sharp edges of the base fragments should reduce the strains on the boundary between the substrate and coating and, correspondingly, enhance the thermal resistance of the samples. Treatment of the niobium pentoxide coating by concentrated light induces a network of fractal micro- and nano-size fractures that compensates the difference of thermal expansion between the layers.

Materials scienceThermal resistanceTantalumNiobiumchemistry.chemical_elementengineering.materialCondensed Matter PhysicsThermal expansionElectronic Optical and Magnetic Materialschemistry.chemical_compoundCoatingchemistryvisual_artvisual_art.visual_art_mediumengineeringPentoxideCeramicNiobium pentoxideComposite materialFerroelectrics
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Enhancement of photoconversion efficiency in dye-sensitized solar cells exploiting pulsed laser deposited niobium pentoxide blocking layers

2015

Abstract Among all the photovoltaic technologies developed so far, dye-sensitized solar cells are considered as a promising alternative to the expensive and environmentally unfriendly crystalline silicon-based solar cells. One of the possible strategies employed to increase their photovoltaic efficiency is to reduce the charge recombination at the cell conductive substrate through the use of a compact blocking layer. In this paper, we report on the fabrication and characterization of dye-sensitized solar cells employing niobium pentoxide (Nb 2 O 5 ) thin film blocking layer deposited through the pulsed laser deposition technique on conductive substrates. The careful selection of the optimal…

Materials scienceOpen circuit voltage decaySubstrate (electronics)Dye-sensitized solar cellsSettore ING-INF/01 - ElettronicaPulsed laser depositionBlocking layer; Dye-sensitized solar cells; Electrochemical impedance spectroscopy; Niobium pentoxide; Open circuit voltage decay; Pulsed laser deposition; Electronic Optical and Magnetic Materials; Materials Chemistry; 2506; Metals and Alloys; 2506; Surfaces Coatings and Films; Surfaces and InterfacesCoatings and Filmschemistry.chemical_compoundElectronicMaterials ChemistryOptical and Magnetic MaterialsCrystalline siliconThin filmNiobium pentoxidepulsed laser depositionbusiness.industryOpen-circuit voltagePhotovoltaic systemMetals and AlloysSurfaces and InterfacesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSurfacesDye-sensitized Solar CellDye-sensitized solar cellniobium pentoxidechemistryblocking layerOptoelectronics2506businessElectrochemical impedance spectroscopyThin Solid Films
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