Semiconductor electrodes. 43. The effect of light intensity and iodine doping on the stabilization of n-silicon by phthalocyanine films
The stability of n-Si vacuum-coated with metal-free phthalocyanine (H/sub 2/Pc) and copper phthalocyanine (CuPc) was studied as a function of the light intensity and redox couple in aqueous solutions. Although the photocurrent at an n-Si coated with H/sub 2/Pc or CuPc decayed slowly at low light intensities (1 mW/cm/sup 2/), photopassivation was rapid at higher light intensities (100 mW/cm/sup 2/). The magnitude of photocurrent and the inhibition photocorrosion depended upon the solution conditions. Addition of iodine, which is a dopane for the Pc layer led to larger photoeffects and a lower rate of photopassivation, although the electrode was still unstable after longer irradiation times. Further improvement in stability was observed in the presence of the highly concentrated electrolyte, 11 M LiCl.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 6538855
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:8; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
COPPER COMPLEXES
CORROSION INHIBITORS
CORROSION RESISTANCE
DISPERSIONS
DOPED MATERIALS
DYES
ELEMENTS
FILMS
HALOGENS
HETEROCYCLIC COMPOUNDS
IODINE
MATERIALS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
PHOTOCHEMISTRY
PHTHALOCYANINES
REDOX REACTIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SILICON DIODES
SOLUTIONS
TRANSITION ELEMENT COMPLEXES