Photoelectrochemical Properties of a Porous Nb<sub>2</sub>O<sub>5</sub> Electrode Sensitized by a Ruthenium Dye

Sayama, Kazuhiro; Sugihara, Hideki; Arakawa, Hironori

doi:10.1021/cm980111l

Cited by 501 publications

(339 citation statements)

References 16 publications

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“…4,14,16 While our conclusions agree with those drawn in ref 5, we note that when making comparisons with titanium dioxide samples (cf. ref 5), it is important to utilize the flatband potential of the correct crystal phase, as many unspecified literature values actually refer to rutile.…”

Section: Resultssupporting

confidence: 91%

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

et al. 1999

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Nanocrystalline SrTiO 3 is synthesized by hydrothermal treatment of nanocrystalline titanium dioxide in the presence of strontium hydroxide. Working photoelectrochemical solar cells are produced using these nanometersized semiconductor particles as photoelectrode materials. At AM 1.5, measured open circuit voltages were roughly 100 mV higher than in solar cells produced using nanocrystalline titanium dioxide (anatase), in agreement with a simple relation between semiconductor conduction band edge and open circuit voltage for these cells. Photocurrents measured in the SrTiO 3 cells were roughly 1/3 those measured with TiO 2 (anatase) -based cells. On the basis of flash laser photolysis and absorptance studies, we suggest that low dye loading and possibly suboptimal dye-oxide interactions can be the cause for the relatively low photocurrents in the SrTiO 3 system.

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Section: Resultssupporting

confidence: 91%

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

et al. 1999

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“…The faster decay in the presence of BQ as compared to N719 at the same excitation of 375 nm may be indicative of energy transfer from the ZnO donor NPs to the N719 acceptor molecules rather than transfer of electrons. In the case of pure ZnO in ethanol (Figure 2b), the excited state lifetime (k nr ) 0) of ZnO NPs is 20.32 ns, which yields a radiative rate constant of 4.92 × 10 7 . Upon the addition of N719 and BQ in separate ZnO NP solution, the average lifetimes were found to reduce to 5.25 and 2.20 ns, with rate constants of 1.90 × 10 8 and 4.55 × 10 8 M -1 s -1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Role of Resonance Energy Transfer in Light Harvesting of Zinc Oxide-Based Dye-Sensitized Solar Cells

et al. 2010

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In this contribution we have studied the dynamics of light harvesting of ZnO nanoparticles (NPs) to a surface adsorbed sensitizing dye (SD) N719. By using the picosecond resolved Förster resonance energy transfer (FRET) technique we have explored that the excited ZnO NPs resonantly transfer visible optical radiation to the SD N719. The consequence of the energy transfer on the performance of the overall efficiency of a model ZnO NP-based dye-sensitized solar cell (DSSC) has also been explored. We have demonstrated that the overall efficiency of a ZnO NP-based solar cell significantly depends on the presence of high-energy photons in the solar radiation. In a control experiment on a model TiO 2 NP-based solar cell it has been demonstrated that the presence of high-energy photon has a minimal effect on the performance of the cell as the TiO 2 NPs are incapable of harvesting high-energy photons from solar radiation. The possibility of the back electron transfer from the excited NPs to the SD has also been investigated by studying the NPs in the presence of an ideal electron accepting organic molecule, benzoquinone (BQ). The time constants and nonradiative rate constant obtained for the ZnO/N719 system are found to be different from those of the ZnO/BQ system, which rules out the possibility of back electron transfer from ZnO NPs to SD N719. Moreover, the observed FRET dynamics in the light harvesting process of the nanocrystalites may be efficient in the further use of the nanoparticles in the development of new photodevices.

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“…The optimum coating thickness was found to be only a few angstroms. Sayama et al [69] studied the photoelectrochemical properties of TiO2, Nb2O5, ZnO, SnO2, In2O3, and other porous semiconductor films sensitized by ruthenium dye. They found that the Nb2O5 semiconductor cell had the highest incident of monochromatic photon-to-current efficiency as compared to the TiO2 cell.…”

Section: Surface Treatment On Other Binary Oxide Photoanodesmentioning

confidence: 99%

Improving the efficiency of dye-sensitized solar cells by photoanode surface modifications

Sun

Dou

et al. 2016

Sci. China Mater.

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Dye-sensitized solar cells (DSSCs) provide a promising alternative solar cell technology because of their high efficiency, environmental friendliness, easy fabrication, and low cost. Power conversion efficiency is an important parameter to measure the performance of DSSCs, but the severe charge recombination that occurs at the photoanode hinders the future improvement of power conversion efficiency. Therefore, one of the key goals for achieving high efficiency is to reduce the energy loss caused by the unwanted charge recombination at various interfaces. From this perspective, surface modification of the photoanode is the simplest method among the various approaches available in the literature for enhancing the performance of DSSCs by inhibiting the interfacial charge recombination. After some brief notes on DSSCs, in this review, we present a comprehensive discussion on surface modifications of different photoanodes that have been adopted in the literature not only for reducing recombination but also for enhancing light harvesting. Depending on the electrode materials, we discuss surface modifications of binary oxides such as TiO2 and ZnO and ternary oxides, including Zn2SnO4, SrSnO3, and BaSnO3. We also talk about methods of surface modification and the materials suitable for surface treatment. Finally, we end with a brief future outlook of DSSCs.

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Photoelectrochemical Properties of a Porous Nb₂O₅ Electrode Sensitized by a Ruthenium Dye

Cited by 501 publications

References 16 publications

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

Role of Resonance Energy Transfer in Light Harvesting of Zinc Oxide-Based Dye-Sensitized Solar Cells

Improving the efficiency of dye-sensitized solar cells by photoanode surface modifications

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Photoelectrochemical Properties of a Porous Nb2O5 Electrode Sensitized by a Ruthenium Dye

Cited by 501 publications

References 16 publications

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

Nanocrystalline Mesoporous Strontium Titanate as Photoelectrode Material for Photosensitized Solar Devices: Increasing Photovoltage through Flatband Potential Engineering

Role of Resonance Energy Transfer in Light Harvesting of Zinc Oxide-Based Dye-Sensitized Solar Cells

Improving the efficiency of dye-sensitized solar cells by photoanode surface modifications

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Photoelectrochemical Properties of a Porous Nb₂O₅ Electrode Sensitized by a Ruthenium Dye