Semiconductor electrodes. 24. Behavior and photoelectrochemical cells based on p-type GaAs in aqueous solutions
The electrochemical behavior of single-crystal p-type GaAs in aqueous solutions containing several redox couples (I/sub 3//sup -//I/sup -/,Fe(III)/Fe(II),SN(IV)/Sn(II),Eu(III)/Eu(II)) in the dark and under irradiation is described. The observation that the difference in potential between that for the onset of photocurrent and the standard potential for the redox couple was 0.4-0.5V, independent of the couple, leads to a revised model for semiconductor/electrolyte solution interface with semiconductors having a high density of surface states with energies within the band-gap region. In such a surface controlled system the Fermi level of the semiconductor is pinned at the surface state level. Several solar cells in which p-GaAs shows stable behavior are described. The cell p-GaAs/I/sub 3//sup -/(0.25 M),I/sup -/(0.75 M)/Pt showed an open-circuit voltage of 0.20 V and a short-circuit current density of 30 mA/cm/sup 2/ under irradiation with 1.7-mW He-Ne laser. The quantum efficiency at the maximum photocurrent in this cell was about 95%.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 5140957
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 102:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
GALLIUM ARSENIDES
ELECTROCHEMISTRY
PHOTOANODES
PERFORMANCE
PHOTOELECTROCHEMICAL CELLS
AQUEOUS SOLUTIONS
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
EUROPIUM COMPOUNDS
EXPERIMENTAL DATA
IODINE COMPOUNDS
IRON COMPOUNDS
LASER RADIATION
P-TYPE CONDUCTORS
PHOTOGALVANIC CELLS
QUANTUM EFFICIENCY
REDOX REACTIONS
STABILITY
TIN COMPOUNDS
VOLTAMETRY
ANODES
ARSENIC COMPOUNDS
ARSENIDES
CHEMICAL REACTIONS
CHEMISTRY
CURRENTS
DATA
DISPERSIONS
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROMAGNETIC RADIATION
EQUIPMENT
GALLIUM COMPOUNDS
HALOGEN COMPOUNDS
INFORMATION
MATERIALS
MIXTURES
NUMERICAL DATA
PHYSICAL PROPERTIES
PNICTIDES
RADIATIONS
RARE EARTH COMPOUNDS
SEMICONDUCTOR MATERIALS
SOLAR EQUIPMENT
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry