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Studies of polycrystalline n-GaAs junctions: effects of metal ion chemisorption on the photoelectrochemical properties of n-GaAs/KOH-Se/sup -/2-/, n-GaAs/CH/sub 3/CH-ferrocene/sup +/0/, and n-GaAs/Au interfaces

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100331a043· OSTI ID:6255134
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Current-voltage and spectral response properties were determined for polycrystalline n-GaAs photoanodes in contact with aqueous KOH-Se/sup -2/-/ and nonaqueous CH/sub 3/CN-ferrocene/sup +/0/-LiClO/sub 4/ electrolytes. The n-GaAs/KOH-Se/sup -/2-/ system initially exhibited poor junction behavior, but chemisorption of Ru/sup III/, Rh/sup III/, Ir/sup III/, Co/sup III/, or Os/sup III/ ions onto the GaAs photoanode was found to yield improved I-V properties. The trend in I-V improvement correlated with improved electrocatalysis of Se/sup 2/minus// oxidation at p-GaAs, N/sup +/-GaAs, and In/sub 2/O/sub 3/ electrode surfaces. The n-GaAs/CH/sub 3/CH system displayed excellent junction behavior and did not respond to metal chemisorption treatments. These results are consistent with the metal-ion-induced improvements being predominantly due to electrocatalytic effects.
Research Organization:
Stanford Univ., CA (USA)
OSTI ID:
6255134
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:20; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
ALKALI METAL COMPOUNDS
ALKANES
ANIONS
ARSENIC COMPOUNDS
ARSENIDES
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISORPTION
COMPLEXES
CYANIDES
DATA
DIENES
ELEMENTS
EXPERIMENTAL DATA
FERROCENE
FLUIDS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
GOLD
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INTERFACES
IONS
IRON COMPLEXES
LIQUIDS
MATERIALS
METALS
METHANE
N-TYPE CONDUCTORS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PNICTIDES
POLYENES
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
POWDERS
SELENIUM
SEMICONDUCTOR MATERIALS
SEMIMETALS
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS