Influence of sensitization of the electron transfer through the interface zinc oxide/electrolyte by salt additions
Journal Article
·
· J. Electrochem. Soc.; (United States)
To study the mechanism of the spectral sensitization with the electrochemical cell + In/ZnO-single crystal/dye + electrolyte/Pt - measurements of the photocurrent influenced by salt additions to the electrolyte were performed. The ZnO-semiconductor-anode operates as a probe for excited states of dyes acting as sensitizer for the charge transfer through the interface zinc oxide/electrolyte. By addition of Br/sup -/, J/sup -/, SCN/sup -/, and SeCN/sup -/ ions to the dye-containing electrolyte a significant increase of the sensitized photocurrent was generated. This enhancement can either be attributed to a change of the dye adsorption on zinc oxide or be explained by the fluorescence quenching of the adsorbed sensitizer in the presence of halide ions. With this quenching, radical anions F/sup -/ or excited triplet states /sup 3/F* of the dyes are produced which are responsible for the increase of the photocurrent. The possible single steps of this reaction are discussed.
- Research Organization:
- Univ., Goettingen, Ger.
- OSTI ID:
- 5132188
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 125:1; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ADDITIVES
CHALCOGENIDES
CHARGE TRANSPORT
CONVERSION
CURRENTS
DYES
ELECTRIC CURRENTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
ELECTRON TRANSFER
ENERGY CONVERSION
INTERFACES
OXIDES
OXYGEN COMPOUNDS
PHOTOGALVANIC CELLS
REAGENTS
SALTS
SENSITIZERS
SOLAR ENERGY CONVERSION
ZINC COMPOUNDS
ZINC OXIDES
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ADDITIVES
CHALCOGENIDES
CHARGE TRANSPORT
CONVERSION
CURRENTS
DYES
ELECTRIC CURRENTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
ELECTRON TRANSFER
ENERGY CONVERSION
INTERFACES
OXIDES
OXYGEN COMPOUNDS
PHOTOGALVANIC CELLS
REAGENTS
SALTS
SENSITIZERS
SOLAR ENERGY CONVERSION
ZINC COMPOUNDS
ZINC OXIDES