Corrosion-induced surface states on n-GaAs as studied by photoluminescence versus voltage scans and luminescence decays
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Univ. of Oregon, Eugene, OR (United States)
Picosecond photoluminescence studies of n-GaAs electrodes have been performed to characterize surface states present at the GaAs/electrolyte interface. Potential-dependent photoluminescence and luminescence decay measurements under high photon flux indicate that as the applied voltage is biased more positive than E[sub CB] - 1 V, new surface states are formed. These appear to be corrosion states since increasing the sulfide (S[sup 2[minus]]) concentration reduces the observed effects. Photocurrent measurements reveal that these corrosion-induced traps are sites of radiationless electron-hole recombination and do not mediate charge transfer. Laser repetition rate experiments indicate that the time to empty and refill the surface states on the uncorroded surface is on the order of microseconds, so these intrinsic traps likely mediate charge transfer. 21 refs., 9 figs.
- DOE Contract Number:
- FG06-86ER45273
- OSTI ID:
- 5462459
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:35; 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-)
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ARSENIC COMPOUNDS
ARSENIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
DIRECT ENERGY CONVERTERS
ELECTRODES
EQUIPMENT
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
LASERS
LUMINESCENCE
PHOTOELECTRIC CELLS
PHOTOLUMINESCENCE
PHOTOVOLTAIC CELLS
PNICTIDES
SOLAR CELLS
SOLAR EQUIPMENT
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ARSENIC COMPOUNDS
ARSENIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
DIRECT ENERGY CONVERTERS
ELECTRODES
EQUIPMENT
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
LASERS
LUMINESCENCE
PHOTOELECTRIC CELLS
PHOTOLUMINESCENCE
PHOTOVOLTAIC CELLS
PNICTIDES
SOLAR CELLS
SOLAR EQUIPMENT
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES