Aggregate formation of eosin-Y adsorbed on nanocrystalline TiO2 films

Yaguchi, Kaori; Furube, Akihiro; Katoh, Ryuzi

doi:10.1016/j.cplett.2012.09.003

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…We expect that our idea can be extended to other systems, where more complex and efficient dyes/solvents are applied. Alternative approaches can be employed to control dye adsorption configurations, such as tuning sensitizing temperature, protonation of TiO 2 surface, and changing sensitizing solvents …”

Section: Discussionmentioning

confidence: 99%

“…Alternative approaches can be employed to control dye adsorption configurations, such as tuning sensitizing temperature, 60 protonation of TiO 2 surface, 61 and changing sensitizing solvents. 62 In addition, the present study of the relationship between microscopic interface structure for dye adsorption and photovoltaic performance provides new insights toward a complete understanding of DSC working mechanisms at the molecular scale.…”

Section: ■ Conclusionmentioning

confidence: 92%

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Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics

Zhang

Jiao

et al. 2014

ACS Appl. Mater. Interfaces

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Adsorption geometry of dye molecules on nanocrystalline TiO2 plays a central role in dye-sensitized solar cells, enabling effective sunlight absorption, fast electron injection, optimized interface band offsets, and stable photovoltaic performance. However, precise determination of dye binding geometry and proportion has been challenging due to complexity and sensitivity at interfaces. Here employing combined vibrational spectrometry and density functional calculations, we identify typical adsorption configurations of widely adopted cyanoacrylic donor-π bridge-acceptor dyes on nanocrystalline TiO2. Binding mode switching from bidentate bridging to hydrogen-bonded monodentate configuration with Ti-N bonding has been observed when dye-sensitizing solution becomes more basic. Raman and infrared spectroscopy measurements confirm this configuration switch and determine quantitatively the proportion of competing binding geometries, with vibration peaks assigned using density functional theory calculations. We further found that the proportion of dye-binding configurations can be manipulated by adjusting pH value of dye-sensitizing solutions. Controlling molecular adsorption density and configurations led to enhanced energy conversion efficiency from 2.4% to 6.1% for the fabricated dye-sensitized solar cells, providing a simple method to improve photovoltaic performance by suppressing unfavorable binding configurations in solar cell applications.

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Section: Discussionmentioning

confidence: 99%

Section: ■ Conclusionmentioning

confidence: 92%

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics

Zhang

Jiao

et al. 2014

ACS Appl. Mater. Interfaces

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“…Chenodeoxycholic acid (CDCA) acts as a co-adsorbate; thus, CDCA can be used to reduce the density of a dye on the surface of an adsorbent. Yaguchi et al [25] found that the shape of the absorption spectrum of eosin Y adsorbed on TiO 2 strongly depends on the presence of CDCA and the concentration of the dye in solution. This finding clearly indicates that dye aggregation can be controlled by the presence of CDCA and dye concentration.…”

Section: Effect Of Aggregationmentioning

confidence: 99%

Improvement of light-harvesting and electron injection efficiencies by lithium ion in D149-sensitized nanocrystalline TiO2 films

Namekawa

Katoh

2015

Chemical Physics Letters

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a b s t r a c tThe effect of Li ion on the light-harvesting and electron injection efficiencies of D149-sensitized nanocrystalline TiO 2 films was studied. Absorption spectra shifted toward the long-wavelength region when films were immersed in a Li ion solution, indicating that Li ion enhanced light-harvesting efficiency. We also found that electron injection efficiency was dramatically enhanced by Li ion. These observations indicate that it is essential to incorporate Li ion in the electrolyte of D149-sensitized solar cell devices to improve their performance.

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“…Indeed, most of the organic dyes at the solid state such as fluorescein or eosin do not present any luminescent properties at all. (De et al, 2005;De and Kundu, 2011;Yaguchi et al, 2012). The absolute PLQYs of LDH-PTPH under powder and paste form are also reported on the Figure 6.…”

Section: Characterisation Of the Pristine Dyes And The Ldh-dyementioning

confidence: 99%

Luminescent N-heterocycles based molecular backbone interleaved within LDH host structure and dispersed into polymer

Legentil

Chadeyron

Thérias

et al. 2020

Applied Clay Science

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A pyrazino-1,3a,6a-triazapentalene dye-based molecule was intercalated by direct coprecipitation method into the galleries of negatively charged layered double hydroxide (LDH) to form a new luminescent LDH filler. The materials of cation composition Zn/Al = 2 lead to well-defined organic inorganic assemblies. The structure of the hybrid materials was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectra (FTIR) and UVvisible spectra. Optical properties of the materials, at both solid state and slurry state, were also recorded and absolute photoluminescent quantum yields (PLQY) were determined showing that the nanohybrid LDH slurry exhibited higher luminescence properties under UV excitation than the corresponding LDH powder. LDH fillers were used to prepare composite films by dispersion in both hydrophobic or hydrophilic polymer matrix such as poly(dimethyl siloxane) (PDMS) and poly(ethylene oxide) (PEO), respectively. Composite films were 3 characterized by Small Angle X-ray Scattering (SAXS) and PLQY were recorded in order to compare the behaviour of the nanohybrid LDH filler in both polymer matrices. It was found that the aggregation of particles is still observed by SAXS.

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Aggregate formation of eosin-Y adsorbed on nanocrystalline TiO2 films

Cited by 6 publications

References 16 publications

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics

Improvement of light-harvesting and electron injection efficiencies by lithium ion in D149-sensitized nanocrystalline TiO2 films

Luminescent N-heterocycles based molecular backbone interleaved within LDH host structure and dispersed into polymer

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Aggregate formation of eosin-Y adsorbed on nanocrystalline TiO2 films

Cited by 6 publications

References 16 publications

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO2 Films for Improved Photovoltaics

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO2 Films for Improved Photovoltaics

Improvement of light-harvesting and electron injection efficiencies by lithium ion in D149-sensitized nanocrystalline TiO2 films

Luminescent N-heterocycles based molecular backbone interleaved within LDH host structure and dispersed into polymer

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Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics

Precise Identification and Manipulation of Adsorption Geometry of Donor−π–Acceptor Dye on Nanocrystalline TiO₂ Films for Improved Photovoltaics