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Title: The effect of hydroxide ion on Cd-chalcogenide/aqueous polysulfide photoelectrochemical cells

Abstract

Alkali hydroxide, added to the aqueous polysulfide electrolyte in n-Cd chalcogenide/S /SUB r/ photoelectrochemical solar cells (PEC's), is is shown to be detrimental to cell performance. It is demonstrated that the added hydroxide increases visible light absorption in the polysulfide solution and decreases the solution lifetime. Even after compensation for the decrease in light tranmission by the electrolyte, added hydroxide is shown to decrease the PEC photocurrent, photovoltage, and optical-to-electrical conversion efficiency. In a cell of 1 cm path length, the transmittance at 580 nm, for solutions containing 2m K/sub 2/S, 3m sulfur, and 0, 2, 6, or 12m KOH, was, respectively, 66, 55, 44, and 37.5%. Analysis of the distribution of ionic species reveals a shift from S/sub 4/ to S/sub 3/ with increasing hydroxide. Compared to S/sub 4/, the peak absorbance of S/sub 3/ is shifted 50 nm toward the vible, causing the variation in solution spectra response with hydroxide. K/sup +/ activty measrements were interpreted as indicative of increasing ion pairing with increased added hydroxide which may adversely effect charge-transfer kinetics. A measured negative shift in polysulfide redox potential with increasing hydroxide is evidently not paralleled by a comparable shift in Cd(SeTe) flatband potential resulting in themore » observed decrease in open-ciruit voltage. Relative conversion efficiency for an electroplated thin film CdSe /SUB 0.65/ Te /SUB 0.35/ electrode was 36% less in polysulfide with 12m KOH compared to the PEC without added KOH. The electrode immersed in 2/2/2, 2/2/3, or 0/1,3/2 (molality KOH/K/sub 2/S/S) exhibited conversion efficiencies of 4.72, 4.80, 5.24, and 5.44, respectively, at 100mW/cm/sup 2/ tungsten-halogen lamp illumination.« less

Authors:
;
Publication Date:
Research Org.:
Department of Materials Research, The Weizmann Institute of Science, Rehovot
OSTI Identifier:
5281699
Resource Type:
Journal Article
Journal Name:
J. Electrochem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 132:5
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PHOTOELECTROCHEMICAL CELLS; ADDITIVES; ELECTROLYTES; ABSORPTION; ABSORPTIVITY; AQUEOUS SOLUTIONS; CADMIUM SELENIDES; CADMIUM TELLURIDES; CHARGE TRANSPORT; ELECTRIC POTENTIAL; ELECTRODES; HALOGENS; ION EXCHANGE; LIGHT BULBS; PHOTOCURRENTS; POTASSIUM HYDROXIDES; REDOX POTENTIAL; THIN FILMS; TUNGSTEN; VISIBLE RADIATION; ALKALI METAL COMPOUNDS; CADMIUM COMPOUNDS; CHALCOGENIDES; CURRENTS; DISPERSIONS; ELECTRIC CURRENTS; ELECTROCHEMICAL CELLS; ELECTROMAGNETIC RADIATION; ELEMENTS; EQUIPMENT; FILMS; HYDROGEN COMPOUNDS; HYDROXIDES; METALS; MIXTURES; NONMETALS; OPTICAL PROPERTIES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POTASSIUM COMPOUNDS; RADIATIONS; SELENIDES; SELENIUM COMPOUNDS; SOLAR EQUIPMENT; SOLUTIONS; TELLURIDES; TELLURIUM COMPOUNDS; TRANSITION ELEMENTS; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-); 400400 - Electrochemistry

Citation Formats

Licht, S, and Manassen, J. The effect of hydroxide ion on Cd-chalcogenide/aqueous polysulfide photoelectrochemical cells. United States: N. p., 1985. Web. doi:10.1149/1.2114018.
Licht, S, & Manassen, J. The effect of hydroxide ion on Cd-chalcogenide/aqueous polysulfide photoelectrochemical cells. United States. doi:10.1149/1.2114018.
Licht, S, and Manassen, J. Wed . "The effect of hydroxide ion on Cd-chalcogenide/aqueous polysulfide photoelectrochemical cells". United States. doi:10.1149/1.2114018.
@article{osti_5281699,
title = {The effect of hydroxide ion on Cd-chalcogenide/aqueous polysulfide photoelectrochemical cells},
author = {Licht, S and Manassen, J},
abstractNote = {Alkali hydroxide, added to the aqueous polysulfide electrolyte in n-Cd chalcogenide/S /SUB r/ photoelectrochemical solar cells (PEC's), is is shown to be detrimental to cell performance. It is demonstrated that the added hydroxide increases visible light absorption in the polysulfide solution and decreases the solution lifetime. Even after compensation for the decrease in light tranmission by the electrolyte, added hydroxide is shown to decrease the PEC photocurrent, photovoltage, and optical-to-electrical conversion efficiency. In a cell of 1 cm path length, the transmittance at 580 nm, for solutions containing 2m K/sub 2/S, 3m sulfur, and 0, 2, 6, or 12m KOH, was, respectively, 66, 55, 44, and 37.5%. Analysis of the distribution of ionic species reveals a shift from S/sub 4/ to S/sub 3/ with increasing hydroxide. Compared to S/sub 4/, the peak absorbance of S/sub 3/ is shifted 50 nm toward the vible, causing the variation in solution spectra response with hydroxide. K/sup +/ activty measrements were interpreted as indicative of increasing ion pairing with increased added hydroxide which may adversely effect charge-transfer kinetics. A measured negative shift in polysulfide redox potential with increasing hydroxide is evidently not paralleled by a comparable shift in Cd(SeTe) flatband potential resulting in the observed decrease in open-ciruit voltage. Relative conversion efficiency for an electroplated thin film CdSe /SUB 0.65/ Te /SUB 0.35/ electrode was 36% less in polysulfide with 12m KOH compared to the PEC without added KOH. The electrode immersed in 2/2/2, 2/2/3, or 0/1,3/2 (molality KOH/K/sub 2/S/S) exhibited conversion efficiencies of 4.72, 4.80, 5.24, and 5.44, respectively, at 100mW/cm/sup 2/ tungsten-halogen lamp illumination.},
doi = {10.1149/1.2114018},
journal = {J. Electrochem. Soc.; (United States)},
number = ,
volume = 132:5,
place = {United States},
year = {1985},
month = {5}
}