The high aqueous solubility of K/sub 2/S and its effect on bulk and photoelectrochemical characteristics of Cd(SeTe)/S/sub X/= cells: II. Variation of sulfur/sulfide ratio
Variation of sulfur/alkali sulfide ratio (X/sub S/) is shown to modify significantly transparency, redox potential, and half-life of aqueous polysulfide solutions. In electrolytes containing 3m total sulfur and various concentration of K/sub 2/S, shift in X/sub S/ from 2.5 to 0.4 is calculated to change the primary polysulfide species S/sub 4//sup =/ to S/sub 3//sup =/ in solution. When these electrolytes are employed in Cd(SeTe)/S/sub X//sup =/ photoelectrochemical solar cells, a decrease in X/sub S/, from 2.5 to 1.8 increases relative optical to electrical conversion efficiencies by 50%, due primarily improvement in fill factor, paralleled by an increase in (HS-). At X/sub S/ < 1.8, photovoltage, photocurrent, and fill factor are depressed. Photovoltage decrease is attributed to negative shifts in redox potential not paralleled by commensurate shifts in flatband potential. At low X/sub S/ an observed decrease in fill factor and photocurrent are related to a decrease in (S/sub 4//sup =/ ) in solution and to ion pairing.
- Research Organization:
- Dept. of Materials Res., The Weizmann Inst. of Science, Rehovot 76100
- OSTI ID:
- 5984387
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 133:2; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
CADMIUM SELENIDE SOLAR CELLS
CADMIUM SULFIDE SOLAR CELLS
CADMIUM TELLURIDE SOLAR CELLS
CHALCOGENIDES
CHEMISTRY
CURRENTS
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTROLYTES
ENERGY EFFICIENCY
EQUIPMENT
OPACITY
OPTICAL PROPERTIES
PHOTOCHEMISTRY
PHOTOCURRENTS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM SULFIDES
QUANTITY RATIO
REDOX POTENTIAL
SOLAR CELLS
SOLAR EQUIPMENT
SOLUBILITY
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT