Electrochemical photovoltaic cells based on n-GaAs and the triiodide/iodide redox couple in acetonitrile
The electrochemical photovoltaic cell (EPC) based on n-GaAs and a CH/sub 3/CN, I/sub 3//sup -//I/sup -/ redox electrolyte was evaluated. Greater than 1MI/sup -/ was necessary to avoid concentration polarization at the photoanode above moderate illumination intensities. The charge separation at the illuminated n-GaAs/electrolyte interface was enhanced by adsorption of Se/sup ./ and Ru/sup +3/ or by complexing polymers such as polyvinyl pyrrolidone. In practical cells, a compromise is necessary between light absorption by I/sub 3//sup -/, and having sufficient I/sub 3//sup -/ to depolarize the counterelectrode. Best ''solar cell'' efficiency in the quiescent electrolyte under 53 mW/cm/sup 2/ irradiation was about 3.4% with V/sub oc/.0.60,i/sub sc/.9 mA/cm/sup 2/, and fill factor 0.34 with no corrections for solution absorbance or cell reflectance. 16 refs.
- Research Organization:
- EIC Lab Inc, Newton, MA, USA
- OSTI ID:
- 6492704
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 129:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PHOTOELECTROCHEMICAL CELLS
DESIGN
PERFORMANCE
ACETONITRILE
ADSORPTION
ELECTROLYTES
FILL FACTORS
GALLIUM ARSENIDES
IODIDES
OPTIMIZATION
PHOTOANODES
REDOX REACTIONS
RUTHENIUM IONS
SELENIUM IONS
ANODES
ARSENIC COMPOUNDS
ARSENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
ELECTROCHEMICAL CELLS
ELECTRODES
EQUIPMENT
GALLIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IODINE COMPOUNDS
IONS
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PNICTIDES
SOLAR EQUIPMENT
SORPTION
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)