Annealed single-crystal cadmium selenide electrodes in liquid junction solar cells
I-V characteristics, voltage dependence of the quantum efficiency, and spectral response were compared for annealed single-crystal CdSe photoanodes. Annealing in cadmium atmosphere improved the overall solar response considerably, while annealing under vacuum revealed a poor response for photon energies larger than 1.8 eV and a high quantum efficiency for near-bandgap energies. This behavior may be attributed to electron-hole pai generation from interbandgap states and a large density of minority carrier recombination centers near the crystal surface, owing to a high nonstoichiometry and a selenium layer at the surface. Annealing in selenium atmosphere resulted in very poor solar response caused by compensation. Simultaneous illumination of the electrodes with a He-Ne lase strongly enhanced the quantum efficiency for vacuum-annealed crystals for near-bandgap photons. We attribute this to electron trapping in the selenium-rich surface, with a resulting increase in depletion-layer width in the cadmium selenide.
- Research Organization:
- Department of Physics, Simon Fraser University, Burnaby, British Columbia
- OSTI ID:
- 5637855
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 131:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM SELENIDE SOLAR CELLS
FABRICATION
SEMICONDUCTOR JUNCTIONS
ELECTRODES
ANNEALING
CONTROLLED ATMOSPHERES
ELECTRIC POTENTIAL
ENERGY GAP
HELIUM-NEON LASERS
LIQUIDS
MONOCRYSTALS
PHOTOANODES
QUANTUM EFFICIENCY
SPECTRAL RESPONSE
VACUUM STATES
ANODES
ATMOSPHERES
CRYSTALS
DIRECT ENERGY CONVERTERS
EFFICIENCY
EQUIPMENT
FLUIDS
GAS LASERS
HEAT TREATMENTS
JUNCTIONS
LASERS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SOLAR CELLS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion