Distingushing between buried semiconductor/metal contacts and hybrid semiconductor/metal/liquid contacts at n-GaAs/KOH-Se[sup [minus]/2[minus]] (aq) junctions
Journal Article
·
· Journal of Physical Chemistry; (United States)
- California Inst. of Technology, Pasadena (United States)
The current-voltage properties of n-GaAs photoanodes have been evaluated in KOH-Se[sup [minus]]/2[minus]/(aq), CH[sub 3]CN-Fe[sup +]/0, and CH[sub 3]CN-MV[sup 2+]/+ solutions. Chemisorption of transition-metal ions (Rh[sup III], Co[sup III], Ru[sup III], Os[sup III]) onto n-GaAs has been shown previously to effect improved photoanode behavior for n-GaAs/KOH-Se[sup [minus]]/2[minus](aq) contacts, but it is not clear whether the chemisorbed metal forms a buried semiconductor/metal junction or results in a hybrid semiconductor/metal/liquid contact. After chemisorption of transition-metal ions, n-GaAs photoanodes displayed different open circuit voltages in contact with each electrolyte solution investigated. The role of the chemisorbed metal in the n-GaAs/M/KOH-Se[sup [minus]]/2[minus](aq) system is, therefore, best described as catalyzing interfacial charge transfer at the semiconductor/liquid interface, as opposed to establishing a semiconductor/metal or semiconductor/insulator/metal contact that is exposed to, but not influenced by, the electrolyte solution. 65 refs., 6 figs., 2 tabs.
- OSTI ID:
- 6028338
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:28; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
400500 -- Photochemistry
ANODES
ARSENIC COMPOUNDS
ARSENIDES
CATALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DISPERSIONS
ELECTROCHEMICAL CELLS
ELECTRODES
EQUIPMENT
EVALUATION
EXPERIMENTAL DATA
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
INFORMATION
MATERIALS
MIXTURES
NUMERICAL DATA
PHOTOANODES
PHOTOELECTROCHEMICAL CELLS
PNICTIDES
SEMICONDUCTOR MATERIALS
SEPARATION PROCESSES
SOLAR EQUIPMENT
SOLUTIONS
SORPTION
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
400500 -- Photochemistry
ANODES
ARSENIC COMPOUNDS
ARSENIDES
CATALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DISPERSIONS
ELECTROCHEMICAL CELLS
ELECTRODES
EQUIPMENT
EVALUATION
EXPERIMENTAL DATA
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
INFORMATION
MATERIALS
MIXTURES
NUMERICAL DATA
PHOTOANODES
PHOTOELECTROCHEMICAL CELLS
PNICTIDES
SEMICONDUCTOR MATERIALS
SEPARATION PROCESSES
SOLAR EQUIPMENT
SOLUTIONS
SORPTION