Thin-film polycrystalline silicon solar cells. Final report, 11 September 1979-10 September 1980
Technical Report
·
OSTI ID:5838033
The object of this work is to understand more about the electrical and optical properties of polycrystalline silicon. This supports the overall goal of obtaining a low-cost, thin-film silicon-cell technology. Quantum-efficiency and laser-scanning techniques were used to determine the diffusion length inside grains and the surface recombination velocity at grain boundaries. For Wacker Silso material we find L = 180 ..mu..m, s = 7 x 10/sup 3/ cm/s, and the average grain size is 1 mm. Several new techniques were developed, including laser scan photoconductivity and liquid-crystal methods. Both of these techniques are sensitive to majority carriers. Solar cells made on Wacker Silso were 18% lower in efficiency than corresponding single-crystal control cells with half of this loss due to grain boundaries. Atomic hydrogen passivation did not improve the efficiency of Wacker Silso solar cells. Direct evidence of phosphorus diffusion down grain boundaries was found. Additional work included deep-level transient spectroscopy, electron-channeling patterns, and work with silicon bi-crystals.
- Research Organization:
- RCA Labs., Princeton, NJ (USA)
- DOE Contract Number:
- AC02-77CH00178
- OSTI ID:
- 5838033
- Report Number(s):
- SERI/PR-0-8276-F; ON: DE82001574
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
CRYSTAL DOPING
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALS
DIFFUSION
DIFFUSION LENGTH
DIMENSIONS
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
ELEMENTS
EPITAXY
EQUIPMENT
ETCHING
FILMS
FLUIDS
GRAIN BOUNDARIES
GRAIN SIZE
HYDROGEN
IMPLANTS
LASERS
LENGTH
LIQUID CRYSTALS
LIQUIDS
MICROSTRUCTURE
NONMETALS
OPTICAL EQUIPMENT
OPTICAL PROPERTIES
OPTICAL SCANNERS
PASSIVATION
PHOSPHORUS
PHOTOCONDUCTIVITY
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
POLYCRYSTALS
QUANTUM EFFICIENCY
RECOMBINATION
SILICON SOLAR CELLS
SIZE
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE FINISHING
TRANSIENTS
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
CRYSTAL DOPING
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALS
DIFFUSION
DIFFUSION LENGTH
DIMENSIONS
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
ELEMENTS
EPITAXY
EQUIPMENT
ETCHING
FILMS
FLUIDS
GRAIN BOUNDARIES
GRAIN SIZE
HYDROGEN
IMPLANTS
LASERS
LENGTH
LIQUID CRYSTALS
LIQUIDS
MICROSTRUCTURE
NONMETALS
OPTICAL EQUIPMENT
OPTICAL PROPERTIES
OPTICAL SCANNERS
PASSIVATION
PHOSPHORUS
PHOTOCONDUCTIVITY
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
POLYCRYSTALS
QUANTUM EFFICIENCY
RECOMBINATION
SILICON SOLAR CELLS
SIZE
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE FINISHING
TRANSIENTS