Photocurrent observed in dye-doped titania gel

Nishikiori, Hiromasa; Tanaka, Nobuaki; Kitsui, Toru; Fujii, Tsuneo

doi:10.1016/j.jphotochem.2005.08.010

Cited by 32 publications

(64 citation statements)

References 19 publications

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“…Some of these values corresponded to the photocurrent data reported in a previous paper, even though the present values are grater than the previous ones due to a difference in the counter electrode [14,15]. In spite of the absorbance decrease, the photocurrent of the electrode increased with an increase in the treatment time while the peak at around 500 nm was only slightly changed.…”

Section: Effects Of Steam Treatmentsupporting

confidence: 85%

“…The IPCE values were almost constant after a 3-h steam treatment [14,15]. The growth and crystallization of the particles and the decrease in the defect density by the steam treatment improved the electric conductivity.…”

Section: Effects Of Steam Treatmentmentioning

confidence: 91%

“…The carboxylate of fluorescein covalently bonding to the titania surface has been detected on by XPS analysis [29]. The absorbance decreased, the spectral peak of the film was red-shifted from around 480 to 485 nm, and the absorption band appeared at 500−600 nm by the steam treatment [14][15][16]30]. These results indicate that the anion was preferentially desorbed from the inside of the titania gel film because the species was weakly trapped in the pores of the gel.…”

Section: Effects Of Steam Treatmentmentioning

confidence: 99%

“…Our previous studies indicated that the steam treatment of the dye-doped amorphous titania film remarkably improved the photo-electric conversion efficiency due to its crystallization [14,15]. The steam treatment leads to the formation of anatase-type titania nanocrystals having the conduction band with higher density and increases in the surface quality of the nanoparticles, which improves the anchoring geometry of the dye on their surface.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous studies, the dye-doped titania gel film was prepared on the ITO plate coated with normal crystalline titania layer, which worked as an electron transport mediator and promoted the electron injection from the dye-doped titania gel to the ITO [14,15]. This layer improved not only the physical adhesion between these layers, but also their electric junction.…”

Section: Introductionmentioning

confidence: 99%

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Photo-electric conversion in dye-doped nanocrystalline titania films

Nishikiori

Uesugi

Tanaka

et al. 2009

Journal of Photochemistry and Photobiology A: Chemistry

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Influences of the titania nanostructure and dye dispersion in a dye-doped titania electrode on its photoelectric conversion property were investigated by simple spectroscopic and electric measurements.The dye-doped nanocrystalline titania electrodes were prepared on the glass plates coated with ITO and normal crystalline titania films by the following two procedures: (1) the dye-doped titania gel films were prepared from a titanium alkoxide solution containing the dye and then steam-treated, and (2) the titanium alkoxide sol containing the dye was refluxed and then spread onto the plates. The photocurrent quantum efficiency remarkably increased by the steam treatment and the reflux compared to that of the untreated dye-doped electrode consisting of amorphous titania gel. The efficiency in the former was higher than that in the latter. The growth and crystallization of the titania particles and the decrease in the defect density by these treatments improved the electric conductivity. The steam treatment was the more prominent method because it enhanced the electric conductivity of the titania depending on its nanostructure and the dye-titania interaction depending on the dye dispersion. These factors appear to play important roles in transport in the electron through the electrode.

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Section: Effects Of Steam Treatmentsupporting

confidence: 85%

Section: Effects Of Steam Treatmentmentioning

confidence: 91%