Multi-colored dye-sensitized solar cells

Otaka, Hideo; Kira, M. A.; Yano, Kentaro; Ito, Shunichiro; Mitekura, Hirofumi; Kawata, Toshio; Matsui, Fumio

doi:10.1016/j.jphotochem.2003.11.012

Cited by 85 publications

(33 citation statements)

References 11 publications

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“…The opportunities that arise from the different IL properties such as the wide electrochemical window, thermal and chemical stability, and negligible volatility are vast. In the beginning, ILs were used as electrolytes mainly because of their low volatility, because common DSCs based on molecular electrolytes had a low long‐term stability owing to leakage . Major obstacles in these attempts to use ILs as electrolytes could mostly be traced back to the high viscosity of the employed ILs, which limited the diffusion and ultimately the performance.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Induced Band Shift of Titanium Dioxide

Weber

Kirchner

2016

ChemSusChem

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Ionic liquids (ILs) have become an established option for the use as electrolytes in dye-sensitized solar cells. In the present study, the adsorption of a multitude of different ILs on a TiO2 surface is studied systematically, focusing on the energetic modifications of the semiconductor. The cation was found to generally cause an energetic downward shift of the TiO2 band levels by accepting electron density from the surface, and the anions were observed to function in the opposite direction, raising the energy levels by donating electron density. Both effects counterbalance each other, leaving the desired outcome dependent on the choice of the specific IL, i.e., the choice of the cation/anion combination. The correlation of the band levels with the properties of the IL was successfully achieved. The dipole moment of the adsorbed ionic liquid species showed little to no correlation with the semiconductor energetics, but the charge transfer calculated by radical Voronoi tessellation revealed a high correlation. The current findings contribute to a deeper understanding of the role of the electrolyte in dye-sensitized solar cells, and ILs in general, and help with choosing and tuning of the electrolyte solutions in existing applications.

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Section: Introductionmentioning

confidence: 99%

Ionic Liquid Induced Band Shift of Titanium Dioxide

Weber

Kirchner

2016

ChemSusChem

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“…This is because the solubility of different dyes varies depending on the polarity of the extraction solvents, hence affecting directly the solubility and anchoring behavior of the extracted dyes onto TiO 2 , which then affect cell overall efficiency [29,30]. Polar aprotic solvents and polar protic solvents are two polar solvents commonly used to extract anthocyanins, and the polarity of these solvents can influence in terms of diffusion of dyes onto the TiO 2 surface, and hence, careful selection of solvent for extraction is important [31].…”

Section: Introductionmentioning

confidence: 99%

Tailoring of extraction solvent of Ixora coccinea flower to enhance charge transport properties in dye-sensitized solar cells

Lim

Damit

Ekanayake

2015

Ionics

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We have tailored the extraction solvent of natural anthocyanin pigments from Ixora coccinea flower to lower charge transport resistance and enhance effective electron diffusion coefficient as well as absorption properties in DSSC sensitization. Six different extraction solvents were used in this study, namely, absolute ethanol, 70 % ethanol, acetone, dimethyl formamide, dimethyl sulfoxide, and distilled water. Dimethyl formamide was found to be able to extract the most anthocyanins from the Ixora flower, followed by dimethyl sulfoxide, acetone, absolute ethanol, 70 % ethanol, and distilled water, respectively. Dye-sensitized solar cells were fabricated using these extracted dyes as sensitizers and the cell performances were measured and characterized. The dye-sensitized solar cell equipped with a dye sensitizer extracted in 70 % ethanol achieved the highest conversion efficiency (ɳ=0.50±0.04 %) owing to its highest electron diffusion coefficient and lowest transport resistance in the TiO 2 /dye/electrolyte interface. This was followed by the cell equipped a with dye sensitizer extracted in acetone (ɳ=0.30±0.04 %), absolute ethanol (ɳ= 0.27±0.01 %), dimethyl formamide (ɳ=0.17±0.01 %), dimethyl sulfoxide (ɳ=0.16±0.01 %), and distilled water (ɳ= 0.09±0.003 %) in conversion efficiency performances, respectively. This study provides an insight into the importance of choosing the right medium for both dye extraction as well as the favorable solvent medium for dye adsorption onto TiO 2 .

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“…Recently, many attempts have been made to improve the photocatalytic performance of TiO 2 under visible-light irradiation, such as transition metal [5] or nonmetal [6,7] doping, noble metal loading [8], semiconductor compounding [9], organic dye sensitizing [10]. In these methods, ion doping is considered as one of the most efficient methods.…”

Section: Introductionmentioning

confidence: 99%

Designed Highly Effective Photocatalyst of Anatase TiO2 Codoped with Nitrogen and Vanadium Under Visible-light Irradiation Using First-principles

Zhao

Liu

2008

Catal Lett

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The supercells of pure anatase TiO 2 , nitrogen and/or vanadium doping anatase TiO 2 were calculated by first-principles with the plane-wave ultrasoft pesudopotentials method. The effects of different ions doping on the crystal structure, electronic structure, optical properties and photocatalytic activity were investigated by means of the calculational data. At the same time realizing visible-light response, nitrogen and vanadium codoping TiO 2 photocatalysts have strong redox potential, and its photocatalytic efficiency would be remarkably improved due to enhancement of electron-hole pairs' separation. The conclusions would have important significance for understanding and further developing of TiO 2 photocatalyst that are activity under visible-light irradiation.

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Multi-colored dye-sensitized solar cells

Cited by 85 publications

References 11 publications

Ionic Liquid Induced Band Shift of Titanium Dioxide

Ionic Liquid Induced Band Shift of Titanium Dioxide

Tailoring of extraction solvent of Ixora coccinea flower to enhance charge transport properties in dye-sensitized solar cells

Designed Highly Effective Photocatalyst of Anatase TiO2 Codoped with Nitrogen and Vanadium Under Visible-light Irradiation Using First-principles

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