Retarded Charge Recombination in Dye-Sensitized Nitrogen-Doped TiO<sub>2</sub> Solar Cells

Tian, Huajun; Hu, Linhua; Zhang, Changneng; Liu, Weiqing; Huang, Yang; Mo, Li-E; Guo, Lei; Sheng, Jiang; Dai, Songyuan

doi:10.1021/jp9103646

Cited by 154 publications

(93 citation statements)

References 34 publications

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“…As mentioned before, the reduction in GO could result in V os in the TiO 2 lattice and the introduction of carbon element into TiO 2 . The carbon replaces oxygen when GO is reduced and the Femi level is shifted upwards when carbon doped in TiO 2 [45], resulting in the enhancement of the V oc . However, based on the previous XPS analysis, the V os increase with the increasing in the amount of the incorporated RGO, which could also function as ''recombination centers'' for the formation of dark current for DSSCs.…”

Section: Photoelectric and Electrochemical Properties Of Rgo Photoanodementioning

confidence: 99%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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The sintered TiO 2 nanofilms were immersed in the aqueous solution of graphite oxide and then were thermally reduced to reduced graphene oxide (RGO), resulting in RGO-doped TiO 2 photoanodes employed in the dye-sensitized solar cells (DSSCs). This preparation method for the reduced graphene oxide-TiO 2 (RGO-TiO 2 ) photoanode could avoid the loss of RGO during the sintering process. The presence of RGO in the photoanodes was confirmed using Raman analysis, scanning electron microscopy, transmission electron microscopy, and energy-dispersive spectrometer. The amount of RGO in photoanode was obtained by thermo-gravimetric analysis. Other techniques such as X-ray diffraction, Brunauer-Emmett-Teller, electron energy loss spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the composite materials of RGO-TiO 2 . The J-V measurement of RGO-TiO 2 -based DSSCs showed that the best photoelectric conversion efficiency (g) of 6.85% is 11.7% higher than that of the pure TiO 2 (P25-TiO 2 )-based DSSCs. It was shown that RGO in the photoanode could facilitate the phase transition in TiO 2 crystals (from anatase to rutile) resulting in the mixed crystals in the photoanodes. The existence of RGO and mixed-crystal structure of TiO 2 changed the electronic transmission pathway, reduced the recombination rate of electron-hole pairs, and thus improved the g of DSSCs.

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Section: Photoelectric and Electrochemical Properties Of Rgo Photoanodementioning

confidence: 99%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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“…Metal doping commonly tailors semiconductor properties by, for example, redistributing defects and trapping levels in the band gap and by changing the conduction band position [18][19][20]. However, metal-doped TiO 2 is impaired due to its thermal instability and increased electron recombination facilities.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Boron Decorated TiO₂Nanoparticles for Dye-Sensitized Solar Cell Photoanode

Ho¹,

Lin

Wang

2015

International Journal of Photoenergy

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Different boron weight percents on mixed-phase (anatase and rutile) TiO 2 nanoparticles were synthesized to investigate structure morphology, defect states, luminescence properties, and energy conversion. The measured results indicate that boron doping of TiO 2 both increases the crystallite size and rutile-phase percent in an anatase matrix. Decreasing the band gap by boron doping can extend the absorption to the visible region, while undoped TiO 2 exhibits high UV absorption. Oxygen vacancy defects generated by boron ions reduce Ti +4 and affect electron transport in dye-sensitized solar cells. Excess electrons originating from the oxygen vacancies of doped TiO 2 downward shift in the conduction band edge and prompt the transfer of photoelectrons from the conduction band of the rutile phase to the lower energy anatase trapping sites; they then separate charges to enhance the photocurrent and sc . Although the resistance of the electron recombination ( ) between doped TiO 2 photoanode and the electrolyte for the doped TiO 2 sample is lower, a longer electron lifetime ( ) of 19.7 ms with a higher electron density ( ) of 2.1 × 10 18 cm −3 contributes to high solar conversion efficiency.

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“…The oxygen vacancy can not only promote electron transport in TiO 2 network but bring an increase of dye adsorption, resulting in an enhanced photocurrent [14,17]. Meanwhile, although the oxygen vacancy in TiO 2 has been proved to be detrimental to long-term stability of DSSCs, the borondoped (B-doped) TiO 2 cells show favorable stability during long period light soaking experiments [14,18,19]. Although there is some progress in the study of B-doped anatase TiO 2 nanoparticles for application in DSSCs, there is little research in B-doped rutile TiO 2 to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Microsphere assembly of boron-doped Rutile TiO2 nanotubes with enhanced photoelectric performance

Zhang

Niu

et al. 2015

J Mater Sci: Mater Electron

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The boron-doped TiO 2 nanotubes assembled microspheres are fabricated for the first time based on our previously proposed anisotropic corrosion mechanism. The obtained samples are screen-printed onto the surface of FTO glass for the application in dye sensitized solar cell (DSSC). The XRD patterns demonstrate the main phase is rutile and the incorporated boron exists at interstitial sites of TiO 2 lattice. The Tafel curves indicate that the flat-band potential of boron doped TiO 2 shifts positively, while the band gap shown in the UV-visible spectra remains unchanged. The electrochemical impedance spectroscopy is employed to investigate the charge transfer properties of DSSCs which shows boron-doped TiO 2 has enhanced electron conductivity and extended electron lifetime. Both advantages are of great importance for the boron-doped photovoltaic device to achieve the favorable photoelectric conversion efficiency of 2.98 % under AM 1.5 illumination of 100 mW cm -2 , which is 51 % higher than that of the un-doped one.

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Retarded Charge Recombination in Dye-Sensitized Nitrogen-Doped TiO₂ Solar Cells

Cited by 154 publications

References 34 publications

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

Characteristics of Boron Decorated TiO₂Nanoparticles for Dye-Sensitized Solar Cell Photoanode

Microsphere assembly of boron-doped Rutile TiO2 nanotubes with enhanced photoelectric performance

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Retarded Charge Recombination in Dye-Sensitized Nitrogen-Doped TiO2 Solar Cells

Cited by 154 publications

References 34 publications

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

Characteristics of Boron Decorated TiO2Nanoparticles for Dye-Sensitized Solar Cell Photoanode

Microsphere assembly of boron-doped Rutile TiO2 nanotubes with enhanced photoelectric performance

Contact Info

Product

Resources

About

Retarded Charge Recombination in Dye-Sensitized Nitrogen-Doped TiO₂ Solar Cells

Characteristics of Boron Decorated TiO₂Nanoparticles for Dye-Sensitized Solar Cell Photoanode