The nitrogen photoactive centre in N-doped titanium dioxide formed via interaction of N atoms with the solid. Nature and energy level of the species

Napoli, F.; Chiesa, Mario; Livraghi, Stefano; Giamello, Elio; Agnoli, Stefano; Granozzi, Gaetano; Pacchioni, Gianfranco; Valentin, C Di

doi:10.1016/j.cplett.2009.06.050

Cited by 87 publications

(72 citation statements)

References 23 publications

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“…They also claim that the formation of these electronic states is the key factor for the improvement in the visible light activity of nitrogen-doped TiO 2 [63]. Napoli and coauthors [64] observed similar mechanism for incorporation of nitrogen species into suboxides by plasma processing. Thus, not only the incorporation of nitrogen states in the film lattice, but also the controlled presence of Ti 3+ is a very important factor to the improvement of the DSSCs.…”

Section: Timentioning

confidence: 86%

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

Duarte

Massi

Sobrinho

2014

International Journal of Photoenergy

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In this paper, nitrogen-doped TiO2thin films were deposited by DC reactive sputtering at different doping levels for the development of dye-sensitized solar cells. The mechanism of film growth during the sputtering process and the effect of the nitrogen doping on the structural, optical, morphological, chemical, and electronic properties of the TiO2were investigated by numerical modeling and experimental methods. The influence of the nitrogen doping on the working principle of the prototypes was investigated by current-voltage relations measured under illuminated and dark conditions. The results indicate that, during the film deposition, the control of the oxidation processes of the nitride layers plays a fundamental role for an effective incorporation of substitutional nitrogen in the film structure and cells built with nitrogen-doped TiO2have higher short-circuit photocurrent in relation to that obtained with conventional DSSCs. On the other hand, DSSCs built with nondoped TiO2have higher open-circuit voltage. These experimental observations indicate that the incorporation of nitrogen in the TiO2lattice increases simultaneously the processes of generation and destruction of electric current.

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Section: Timentioning

confidence: 86%

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

Duarte

Massi

Sobrinho

2014

International Journal of Photoenergy

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“…However, nitrogen is incorporated in the TiO 2 (N-TiO 2 ), with the N 1s peak at 400.0 eV. This peak which has been observed in the previous reports of N-doped anatase and rutile is attributed to interstitial N, probably in the connection of Ti-O-N or Ti-N-O [34][35][36][37][38]. According to the nitrogen and titanium peak areas and the reported sensitivity factors, the N/Ti atomic ratio is estimated to be ~7.0% [39].…”

Section: Impurity Incorporationmentioning

confidence: 94%

TiS2 transformation into S-doped and N-doped TiO2 with visible-light catalytic activity

Lin

Chien

Lai

et al. 2015

Applied Surface Science

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“…35 Plasma treatment is another approach that stands out as a way to effectively incorporate substitutional nitrogen into the titania lattice. 20,[36][37][38][39][40][41][42][43][44][45] Moreover, while many of the methods listed above require high temperature or solvent-based treatments, plasmaassisted doping is conducted at relatively low temperature at which the nanostructure of TiO 2 can be maintained.…”

Section: Introductionmentioning

confidence: 99%

Remarkable Enhancement of Photocatalytic Water Oxidation in N₂/Ar Plasma Treated, Mesoporous TiO₂ Films

et al. 2016

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Mesoporous TiO 2 films treated with N 2 /argon plasma were studied for ultraviolet and visible light induced photocatalytic water oxidation activity. Compared to pristine TiO 2 films, plasma treated TiO 2 films showed remarkable enhancement of photocurrents (up to 80-240 times) in both ultraviolet light and visible light, greatly surpassing enhancements previously reported in the literature. The cubic ordered mesoporous TiO 2 thin films were prepared by a surfactanttemplated sol-gel method and were treated with N 2 /argon plasma, an approach hypothesized to capitalize on the high degree of disorder in the material and the high energy of the plasma species to achieve efficient nitrogen doping. The effects of reaction gas pressure and N 2 gas flow rate on photoelectrochemical (PEC) response were investigated. UV-vis absorbance spectra indicated that the incorporated N atoms significantly reduced the band gap of TiO 2 with the enhancement of visible light absorption, and XPS analysis showed primarily substitutional N atoms incorporation rather than interstitial. The photocatalytic activity of nitrogen-doped TiO 2 (N-TiO 2 ) films was evaluated by chronoamperometry and linear sweep voltammetry. The effect of light sources on PEC performance was explored using UV (365 nm), blue (455 nm) and green (530 nm) LEDs. N-TiO 2 films showed 242x and 240x enhancement of photocurrent, compared to undoped TiO 2 films under UV and blue LED irradiation, respectively. The N-doped films also showed overall enhancement of up to 70x and 92x with a broad spectrum Xe arc lamp and halogen bulb, respectively, and photocatalytic activity even with green LED illumination, compared to no measurable activity without doping. The present study shows that plasmainduced doping of sol-gel materials enables the efficient incorporation of heteroatoms into disordered metal oxide nanostructures, thereby leading to remarkable enhancement in visiblelight driven photoelectrochemical water oxidation.

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The nitrogen photoactive centre in N-doped titanium dioxide formed via interaction of N atoms with the solid. Nature and energy level of the species

Cited by 87 publications

References 23 publications

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

TiS2 transformation into S-doped and N-doped TiO2 with visible-light catalytic activity

Remarkable Enhancement of Photocatalytic Water Oxidation in N₂/Ar Plasma Treated, Mesoporous TiO₂ Films

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The nitrogen photoactive centre in N-doped titanium dioxide formed via interaction of N atoms with the solid. Nature and energy level of the species

Cited by 87 publications

References 23 publications

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

Development of Dye-Sensitized Solar Cells with Sputtered N-DopedTiO2Thin Films: From Modeling the Growth Mechanism of the Films to Fabrication of the Solar Cells

TiS2 transformation into S-doped and N-doped TiO2 with visible-light catalytic activity

Remarkable Enhancement of Photocatalytic Water Oxidation in N2/Ar Plasma Treated, Mesoporous TiO2 Films

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Remarkable Enhancement of Photocatalytic Water Oxidation in N₂/Ar Plasma Treated, Mesoporous TiO₂ Films