Zinc Oxide Photoelectrode Research Articles

Novel micro-ring structured ZnO photoelectrode for dye-sensitized solar cell

The micro-ring like structured zinc oxide (ZnO) film was deposited on SnO2: F coated glass substrate by sol-gel dip-coating technique with 1.0 g polyethylene glycol (PEG) content. The surface morphology of micro-ring structured ZnO film has been confirmed by the scanning electron microscope. This ZnO film is used to fabricate the solar cell with the help of ruthenium based dye and carbon counter electrode. The photoelectric and incident photon-to-current conversion efficiency was 1.17% and 48.4%, respectively. The DSC results have been compared with ZnO films prepared without PEG contents.

Novel micro-ring structured ZnO photoelectrode for dye-sensitized solar cell

Abstract The micro-ring like structured zinc oxide (ZnO) film was deposited on SnO2: F coated glass substrate by sol-gel dip-coating technique with 1.0 g polyethylene glycol (PEG) content. The surface morphology of micro-ring structured ZnO film has been confirmed by the scanning electron microscope. This ZnO film is used to fabricate the solar cell with the help of ruthenium based dye and carbon counter electrode. The photoelectric and incident photon-to-current conversion efficiency was 1.17% and 48.4%, respectively. The DSC results have been compared with ZnO films prepared without PEG contents.

Study of sol-gel derived porous ZnO photoelectrode for the application of dye-sensitized solar cells

In this study, the porous zinc oxide (ZnO) films were deposited on SnO2:F coated glass substrate by sol-gel technique with zinc acetate as precursor, ethanol as solvent, and diethanolamine as chelating agent. Two sets of ZnO films with equal number of coatings and the same film thicknesses were deposited with various zinc acetate concentrations. The surface morphology of the porous ZnO film strongly depends on the zinc acetate concentration. It was also revealed from the optical study that the dye absorption increases with an increase in the zinc acetate concentration. The ZnO film with 1.0mol∕l zinc acetate concentration has shown the best porous structure and maximum rms roughness value (187nm). The maximum photoelectric conversion efficiencies, 0.64% and 0.8%, were achieved for ZnO films with 1.0mol∕l of zinc acetate concentration in both sets of samples: equal number of coatings and the same film thicknesses, respectively.

Dynamic photocapacitance measurement of zinc oxide photoelectrode in aqueous solution

A dynamic photocapacitance method using the pulsed electrode potential was developed for measurement of the charge concentration of photoinduced deep traps and their recombination rates along the depth of the electrode. The validity of this method to bulk states was demonstrated by its application to a deep intervalence state which was found at 2.5 eV below the conduction band. Its absorption constant was estimated at 7.7 {times} 10{sup {minus}3} cm{sup {minus}1} on the assumption of a quantum yield of unity. The trap produced from the deep state by photoexcitation is distributed inside the crystal with a concentration of 10{sup 14} cm{sup {minus}3}; thus, the observed are bulk states. A cross section of trap recombination with electrons was 3.6 {times} 10{sup {minus}19} cm{sup 2}, which suggests that the photoinduced trap is neutral and accordingly the original intervalence state is anionic. Disturbance by surface states was observed in the measurements of the deep state.