The high aqueous solubility of K/sub 2/S and its effect on bulk and photoelectrochemical characteristics of Cd(SeTe)/S/subX= cells: 1. Polysulfide variation at constant sulfur/sulfide ratio
The aqueous solubility of K/sub 2/S is measured to be 5.6, 8.9, and 11.3m at 0/sup 0/, 25/sup 0/, and 72/sup 0/C. respectively. The high K/sub 2/S solubility, compared to that of Na/sub 2/S, is discussed. An increase in potassium sulfide concentration in polysulfide solutions containing a fixed ratio of dissolved sulfur to alkali sulfide is shown to: (i) modify the distribution of polysulfide species in solution, (ii) increase the solution-absorbance of light, (iii) negatively shift the redox potential, (iv) increase the calculated disproportionation-limited lifetime of the solution, and (v) decrease potassium ion activity. Thin film Cd(SeTe) photoelectrochemical solar cells were investigated with polysulfide electrolytes containing 0.5 to 8.5m K/sub 2/S. At either lower or higher sulfide concentrations, photocurrent, fill factor, and conversion efficiency are depressed. A relative gain in efficiency >30% is achieved with electrolytes of intermediate concentration containing 1 to 2m potassium sulfide.
- Research Organization:
- Dept. of Materials Res., The Weizmann Inst. of Science, Rehovot 76100
- OSTI ID:
- 5984402
- 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
ABSORPTIVITY
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CADMIUM SELENIDE SOLAR CELLS
CADMIUM SULFIDE SOLAR CELLS
CADMIUM TELLURIDE SOLAR CELLS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CURRENTS
DIRECT ENERGY CONVERTERS
DISPERSIONS
DISSOLUTION
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTROLYTES
EQUIPMENT
FILL FACTORS
MEDIUM TEMPERATURE
MIXTURES
OPTICAL PROPERTIES
OXIDATION
PHOTOCHEMISTRY
PHOTOCURRENTS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM SULFIDES
QUANTITY RATIO
REDOX POTENTIAL
REDUCTION
SODIUM COMPOUNDS
SODIUM SULFIDES
SOLAR CELLS
SOLAR EQUIPMENT
SOLUBILITY
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS