Thin films and nanostructures of niobium pentoxide: fundamental properties, synthesis methods and applications

Rani, Rozina Abdul; Zoolfakar, Ahmad Sabirin; O’Mullane, Anthony P.; Austin, Michael W.; Kalantar‐zadeh, Kourosh

doi:10.1039/c4ta02561j

Cited by 271 publications

(185 citation statements)

References 267 publications

(353 reference statements)

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“…Nb 2 O 5 is a transparent, air-stable and water-insoluble material with extensive polymorphism. Tuning of the band gap of niobium oxides is possible by changing stoichiometry and crystallinity [14,15]. The conduction band (CB) is composed mainly by unoccupied Nb 5 þ 4D-orbitals and it is 0.2 À 0.4 eV below the CB in TiO 2 [16,17].…”

Section: Introductionmentioning

confidence: 99%

Nb2O5 hole blocking layer for hysteresis-free perovskite solar cells

et al. 2016

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a b s t r a c tPerovskite solar cells have attracted attention due its high conversion efficiency and low cost. In this work, Nb 2 O 5 is used as an alternative compact hole blocking layer in conjunction with mesoporous TiO 2 and CH 3 NH 3 PbI 3 in perovskite solar cells. The influence of Nb 2 O 5 layer thickness was studied and it was found to strongly influence the J-V hysteresis of the cells. Devices constructed with 50 nm Nb 2 O 5 have small or undetectable hysteresis, which becomes detectable and increases with increasing Nb 2 O 5 layer thickness. For the best device, energy conversion efficiency of up to 12%, short-circuit currents of 17 mA/cm 2 and fill factors of 74% were found. These parameters are comparable to the best performance of similar devices where the compact layer is TiO 2 . In addition, the use of Nb 2 O 5 improved the stability of the solar cells under illumination. These improvements are attributed to a better extraction of photogenerated electrons in the perovskite layer.

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Section: Introductionmentioning

confidence: 99%

Nb2O5 hole blocking layer for hysteresis-free perovskite solar cells

et al. 2016

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“…In particlar, nanostructured Nb 2 O 5 offers high surface to volume ratios and quantum confinement effects that enable unique physical and chemical interactions at the surface [8][9][10]. As a result, such morphological manipulations significantly influence the optical and electronic properties of Nb 2 O 5 .…”

Section: Introductionmentioning

confidence: 99%

Narrow-bandgap Nb2O5 nanowires with enclosed pores as high-performance photocatalyst

Zhang

Zhao

et al. 2018

Sci. China Mater.

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“…Niobium pentoxide is an important oxide with potential applications in several fields, including Electrochromism and Catalysis [1,2]. It is considered as a catalyst material, being used to prepare some crystals with technological applications such as KNbO 3 and NaNbO 3 [3].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Joya

Barba-Ortega

Raba-Páez

et al. 2017

Metals

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Abstract:In this work, a set of nanoparticles of Nb 2 O 5 nanoparticles were grown by both the Pechini and the sol-gel methods. The amorphous materials were calcined at 650 • C or at 750 • C. X-ray diffraction, scanning electron microscopy, luminescence and Raman spectroscopy were used in order to characterize the materials. From the study, it is possible to state that the method of production of nanoparticles, beyond the temperature of synthesis, has a great influence on whether the phase produced is hexagonal or orthorhombic. Additionally, compared to de Sol-gel method, the Pechini method produced samples with smaller particle sizes. The photoluminescence spectra of niobium pentoxide nanostructure materials show that the emission peaks are positioned between 334 to 809 nm and there is a change of intensity which varies depending on the synthesis route used. High pressure Raman spectra at room temperature were obtained from two samples grown by the sol-gel method. Up to 6 GPa, where it is possible to observe the Raman bands, no modification other than the increase of disorder was observed, and this can be associated with a change of phase.

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Thin films and nanostructures of niobium pentoxide: fundamental properties, synthesis methods and applications

Cited by 271 publications

References 267 publications

Nb2O5 hole blocking layer for hysteresis-free perovskite solar cells

Nb2O5 hole blocking layer for hysteresis-free perovskite solar cells

Narrow-bandgap Nb2O5 nanowires with enclosed pores as high-performance photocatalyst

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

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