Photoexcitation of neodymium doped TiO2 for improved performance in dye-sensitized solar cells

D’Souza, Laveena P.; Shwetharani, R.; Amoli, Vipin; Fernando, C. A. N.; Sinha, Anil K.; Balakrishna, R. Geetha

doi:10.1016/j.matdes.2016.05.007

Cited by 46 publications

(11 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead of replacing the substituent Ti 4+ positions, the Nd species may be preferentially located on the TiO2 surface and/or in the octahedral interstices of the titania lattice [27]. Doping with Nd also increased the intensity of the peaks and did not cause phase change, giving the material greater stability, as previously reported [24,29].…”

Section: Crystallinity (Xrd) and Ce/nd Doping (Xrf) Of Photocatalystsmentioning

confidence: 57%

“…4. A broad PL emission band was observed in the visible region (~ 500 nm), probably related to the transitions occurring due to the recombination of the electron-hole pairs in surface defects/surface oxygen vacancies [29]. A similar intensity and shape were observed in the PL spectra for all samples, regardless of the excitation wavelength and doping metal.…”

Section: Photoluminescence Analysismentioning

confidence: 67%

See 1 more Smart Citation

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Vieira

Scaratti

Rodembusch

et al. 2019

Environmental Technology

View full text Add to dashboard Cite

The impact of cerium (Ce) and neodymium (Nd) rare-earth metal doping of TiO2 prepared by hydrothermal method was investigated to tailor effective photocatalytic degradation of colored wastewater under UV or visible illumination. The hydrothermal treatment of TiO2 decreased the pHpzc from 6.3 to 3.1-3.8 favoring the affinity for cationic water contaminants. Doping with Ce and Nd modified the crystallinity and the morphology of the photocatalysts and significantly increased the BET surface area and the adsorption capacity of cationic dyes. The photocatalytic activity under UV light irradiation decreased due to shielding of the catalyst active area by excessive amount of dye adsorbed. Conversely, the photocatalytic activity of the Ce and Nd doped TiO2 increased under visible light irradiation by 1.2 times as a result of the dye photosensitization effect. It was demonstrated that two-steps dark adsorption and photocatalytic reaction or one-step simultaneous adsorption and reaction can produce significantly different results for the photocatalytic degradation of dyes in coloured waters, the rate being controlled by the competitive adsorption of the reacting organics and the H2O/OHspecies. The reaction is driven by the radical oxygen species (ROS) formed on the catalyst surface the nature of which, differs under UV or visible light irradiation. The Ce-doped TiO2 and Nd-doped TiO2 photocatalysts with 0.5% rare-earth content were found to be efficient in the degradation of MB in aqueous solution, removing the color and reducing the toxicity of wastewaters.

show abstract

Section: Crystallinity (Xrd) and Ce/nd Doping (Xrf) Of Photocatalystsmentioning

confidence: 57%

Section: Photoluminescence Analysismentioning

confidence: 67%

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Vieira

Scaratti

Rodembusch

et al. 2019

Environmental Technology

View full text Add to dashboard Cite

show abstract

“…(4) [19]. However, Y=1%, Y=2%, and Y=3% samples showed an increase in lattice parameters and decreased crystallite size which can be related to high lattice distortion in the crystallization process [21]. It was found that variation in ionic radius of Y and Ti changed the axis values and a helped to separate the electrons or removed the possibility of recombination of hole and electron pairs [22].…”

Section: D=( )mentioning

confidence: 99%

Yttrium Doped TiO2 Thin Film for Gas Sensing Application Prepared by Spin Coating Method

Kaiyum

Ahmed²,

Arif³

et al. 2020

Preprint

View full text Add to dashboard Cite

Yttrium (Y) doped and pure Titanium Di-oxide (TiO2) thin films were prepared by using spin coater. The coater was set up in laboratory with low cost investment. The films were calcined at 450 °C for 1 hour. For characterization, Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Atomic Force Microscopy (AFM) were carried out. LCR Bridge - GW Instek LCR-821 was used for gas sensing applications. XPS showed that the change of electronic structure due to Y doping. SEM and AFM analysis were carried out to determine the surface morphology of the films. Yttrium (Y) decreased the crystallite size of the films and increased the surface roughness and porosity value, which was very good for many sensing applications. Gas sensing property of the deposited films were improved by the incorporation of yttrium impurities and the sensing property improved almost two times than pure TiO2 thin film. Different researches have been done their research related to this topic but no one researchers provide a precise explanation of their results, authors of this research have tried to do that. Moreover the films were prepared by a simple spin coater to reduce the production cost also.

show abstract

“…Furthermore, the presence of massive injected electrons might promote the electrons to recombine with the oxidized dye molecules, in which the process usually happens in the range of micro-to milliseconds [1][2][3][4][5][6][7]. These recombination processes occur at the TiO 2 -dye-electrolyte interface with their probability determined by the kinetics recombination reaction.Several strategies were introduced to suppress the charge recombination process, for instance, the introduction of metal and/or non-metal element doping [8][9][10][11][12][13][14][15][16][17], as well as metal oxide coatings [18][19][20][21][22][23], as a passivation or blocking layer. The substitution of Ti 4+ with a different cationic dopant (typically metal-type dopant) modifies the conduction band, while replacing the O 2− with different anions affects the valence band of TiO 2 .…”

mentioning

confidence: 99%

“…Several strategies were introduced to suppress the charge recombination process, for instance, the introduction of metal and/or non-metal element doping [8][9][10][11][12][13][14][15][16][17], as well as metal oxide coatings [18][19][20][21][22][23], as a passivation or blocking layer. The substitution of Ti 4+ with a different cationic dopant (typically metal-type dopant) modifies the conduction band, while replacing the O 2− with different anions affects the valence band of TiO 2 .…”

mentioning

confidence: 99%

Trap State and Charge Recombination in Nanocrystalline Passivized Conductive and Photoelectrode Interface of Dye-Sensitized Solar Cell

et al. 2020

View full text Add to dashboard Cite

The dynamic competition between electron generation and recombination was found to be a bottleneck restricting the development of high-performance dye-sensitized solar cells (DSSCs). Introducing a passivation layer on the surface of the TiO 2 photoelectrode material plays a crucial role in separating the charge by preventing the recombination of photogenerated electrons with the oxidized species. This study aims to understand in detail the kinetics of the electron recombination process of a DSSC fabricated with a conductive substrate and photoelectrode film, both passivized with a layer of nanocrystalline TiO 2 . Interestingly, the coating, which acted as a passivation layer, suppressed the back-electron transfer and improved the overall performance of the integrated DSSC. The passivation layer reduced the exposed site of the fluorine-doped tin oxide (FTO)-electrolyte interface, thereby reducing the dark current phenomenon. In addition, the presence of the passivation layer reduced the rate of electron recombination related to the surface state recombination, as well as the trapping/de-trapping phenomenon. The photovoltaic properties of the nanocrystalline-coated DSSC, such as short-circuit current, open-circuit voltage, and fill factor, showed significant improvement compared to the un-coated photoelectrode film. The overall performance efficiency improved by about 22% compared to the un-coated photoelectrode-based DSSC.The mesoporous oxide photoelectrode material is the heart of a DSSC. It has responsibilities in anchoring the molecules of the dye sensitizer, and it acts as a medium for the transportation of electrons. In recent years, the development of binary and ternary oxide nanostructured photoelectrode materials such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), tin oxide (SnO 2 ), and zinc tin oxide (Zn 2 SnO 4 ) attracted great attention due to their suitable conduction band and unique characteristics for DSC application. As of now, TiO 2 is the semiconductor of choice due to its promising properties such as wide bandgap energy, low cost, abundance, and non-toxic oxides. Moreover, the chemical inertness of TiO 2 makes it possible to allow the dye sensitizer molecule, which commonly has a carboxylate anchoring group, to be attached to the photoelectrode surface. Additionally, other distinguishing features of TiO 2 such as the high relative permittivity of anatase (~30-40) helps in lowering the electrostatic interaction between the injected electrons and oxidized dye molecules, thus reducing the possibilities of electron recombination [5]. Anatase (E g = 3.23 eV), rutile (E g = 3.05 eV), and brookite (E g = 3.26 eV) are three crystalline TiO 2 polymorphs that naturally exist. Brookite with an orthorhombic structure is difficult to synthesize in the laboratory compared to anatase and rutile. Even though rutile and anatase have the same tetragonal structure, a higher Fermi level of anatase by 0.1 eV compared to rutile makes it more desirable for DSSC application [6].When the photosensitized dye receives e...

show abstract

Photoexcitation of neodymium doped TiO2 for improved performance in dye-sensitized solar cells

Cited by 46 publications

References 63 publications

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Yttrium Doped TiO2 Thin Film for Gas Sensing Application Prepared by Spin Coating Method

Trap State and Charge Recombination in Nanocrystalline Passivized Conductive and Photoelectrode Interface of Dye-Sensitized Solar Cell

Contact Info

Product

Resources

About

Photoexcitation of neodymium doped TiO2 for improved performance in dye-sensitized solar cells

Cited by 46 publications

References 63 publications

Tuning the photoactivity of TiO2 nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Tuning the photoactivity of TiO2 nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Yttrium Doped TiO2 Thin Film for Gas Sensing Application Prepared by Spin Coating Method

Trap State and Charge Recombination in Nanocrystalline Passivized Conductive and Photoelectrode Interface of Dye-Sensitized Solar Cell

Contact Info

Product

Resources

About

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters

Tuning the photoactivity of TiO₂ nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters