The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Jin Z Zhang - One of the best experts on this subject based on the ideXlab platform.
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ultrafast electron injection implications for a photoelectrochemical cell utilizing an anthoCyanin dye sensitized tio2 nanocrystalline electrode
Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of <100 fs for Cyanin-sensitized TiO2 nanoparticles is assigned to electrons injected from the dye to TiO 2. This signal is fit to a double-exponential decay with time constants of 0.52 and 67 ps. The 0.52 ps component is due to trapping of conduction band electrons or to fast direct recombination with the dye cation, while the 67 ps decay is attributed to trap state mediated indirect recombination. In contrast, stimulated emission with a 2.6 ps decay time is observed for Cyanin in solution, Cyanin on ZrO2, and Cyanin complexed with Al(III) ions. When compared to the photon-to-current efficiency measured for the solar cell, the efficiency estimated from the injection and recombination rate constants suggests that electron recapture by the redox mediator and light screening mechanisms may limit the efficiency of the cell.
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Ultrafast Electron Injection: Implications for a Photoelectrochemical Cell Utilizing an AnthoCyanin Dye-Sensitized TiO2 Nanocrystalline Electrode
The Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Michael Gra, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of
Nerine J Cherepy - One of the best experts on this subject based on the ideXlab platform.
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ultrafast electron injection implications for a photoelectrochemical cell utilizing an anthoCyanin dye sensitized tio2 nanocrystalline electrode
Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of <100 fs for Cyanin-sensitized TiO2 nanoparticles is assigned to electrons injected from the dye to TiO 2. This signal is fit to a double-exponential decay with time constants of 0.52 and 67 ps. The 0.52 ps component is due to trapping of conduction band electrons or to fast direct recombination with the dye cation, while the 67 ps decay is attributed to trap state mediated indirect recombination. In contrast, stimulated emission with a 2.6 ps decay time is observed for Cyanin in solution, Cyanin on ZrO2, and Cyanin complexed with Al(III) ions. When compared to the photon-to-current efficiency measured for the solar cell, the efficiency estimated from the injection and recombination rate constants suggests that electron recapture by the redox mediator and light screening mechanisms may limit the efficiency of the cell.
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Ultrafast Electron Injection: Implications for a Photoelectrochemical Cell Utilizing an AnthoCyanin Dye-Sensitized TiO2 Nanocrystalline Electrode
The Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Michael Gra, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of
Greg P Smestad - One of the best experts on this subject based on the ideXlab platform.
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ultrafast electron injection implications for a photoelectrochemical cell utilizing an anthoCyanin dye sensitized tio2 nanocrystalline electrode
Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of <100 fs for Cyanin-sensitized TiO2 nanoparticles is assigned to electrons injected from the dye to TiO 2. This signal is fit to a double-exponential decay with time constants of 0.52 and 67 ps. The 0.52 ps component is due to trapping of conduction band electrons or to fast direct recombination with the dye cation, while the 67 ps decay is attributed to trap state mediated indirect recombination. In contrast, stimulated emission with a 2.6 ps decay time is observed for Cyanin in solution, Cyanin on ZrO2, and Cyanin complexed with Al(III) ions. When compared to the photon-to-current efficiency measured for the solar cell, the efficiency estimated from the injection and recombination rate constants suggests that electron recapture by the redox mediator and light screening mechanisms may limit the efficiency of the cell.
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Ultrafast Electron Injection: Implications for a Photoelectrochemical Cell Utilizing an AnthoCyanin Dye-Sensitized TiO2 Nanocrystalline Electrode
The Journal of Physical Chemistry B, 1997Co-Authors: Nerine J Cherepy, Greg P Smestad, Michael Gra, Jin Z ZhangAbstract:colloidal TiO2 powder, is shown to convert sunlight to electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching is observed for the excited state of the TiO2-adsorbed anthoCyanin dye, Cyanin, and the photocurrent spectrum correlates well with the optical absorption of the Cyanin-sensitized TiO 2 nanocrystalline film. The incident photon-to-current efficiency of 19% at the peak of the visible absorption band of the dye, the open-circuit voltages of 0.5-0.4 V, and short-circuit photocurrents of 1.5-2.2 mA/cm 2 are remarkable for such a simple system and suggest efficient charge carrier injection. The ultrafast excitedstate dynamics of Cyanin in solution are compared with those of surface-adsorbed Cyanin on TiO2 and ZrO2 colloids, as well as complexed with Al(III) ions. A transient absorption signal with a risetime of
El-zeiny M. Ebeid - One of the best experts on this subject based on the ideXlab platform.
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Hybrid organic and inorganic solar cell based on a Cyanine dye and quantum dots
Journal of Photochemistry and Photobiology A: Chemistry, 2019Co-Authors: Mostafa F. Abdelbar, Tarek A. Fayed, T. Meaz, Thiyagu Subramani, Naoki Fukata, El-zeiny M. EbeidAbstract:Abstract The combination of organic dyes with quantum dots (QDs) in solar cells can lead to more improvement in photovoltaic performance for such types of solar cells. Due to the quantum confinement, the photoluminescence (PL) of QDs can be tuned to match the absorption spectra of applied organic dyes. Herein, we introduce a new hybrid solar cell based on monomethine Cyanine dye co-sensitized by CdS and CdTe/CdS core shell. The Cyanine dye tends to aggregate on the surface of colloidal QDs due to electrostatic attraction followed by energy and electron transfer from QDs to Cyanine dye. Electrophoretic deposition method was carried out to assist the Cyanine dye loading on the surface of TiO2 thin film and the highest power conversion efficiency was 0.89% in case of Cyanine dye co-sensitized by CdTe/CdS with open circuit voltage of 0.78 V and a photocurrent of 1.80 mA/ cm2.
M. T. Spitler - One of the best experts on this subject based on the ideXlab platform.
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Spectral Sensitization of TiO2 Nanocrystalline Electrodes with Aggregated Cyanine Dyes
The Journal of Physical Chemistry B, 2001Co-Authors: A. Ehret, And L. Stuhl, M. T. SpitlerAbstract:New chromophores were explored for use in dye-sensitized solar cells. The attachment of various di-carboxylated Cyanine dyes to nanocrystalline TiO2 was examined spectroscopically and through their performance in a sensitized solar cell. It was found that aggregated forms of these Cyanine dyes sensitized with an efficiency equal to that of the monomer form and that combinations of Cyanine dyes could be used to sensitize solar cells over the entire visible spectrum. With the high extinction coefficients of the organic dyes, short circuit photocurrents for these Cyanine-sensitized systems was maximized at a 4 μm thickness of the nanocrystalline TiO2. Short circuit photocurrents for these 4 μm solar cells were found to exceed that of ruthenium coordination complexes.
