Process Research of Polycrystalline Silicon Material (PROPSM)
Recent reported results of hydrogen-passivated polycrystalline silicon solar cells are summarized. Most of the studies have been performed on very small grain or short minority-carrier diffusion length silicon. Hydrogenated solar cells fabricated from this material appear to have effective minority-carrier diffusion lengths that are still not very long, as shown by the open-circuit voltages of passivated cells that are still significantly less than those of single-crystal solar cells. The short-circuit current of solar cells fabricated from large-grain cast polycrystalline silicon is nearly equivalent to that of single-crystal cells, which indicates long bulk monitority-carrier diffusion length. However, the open-circuit voltage, which is sensitive to grain boundary recombinaton, is 20 to 40 mV less. The goal of this program is to minimize the variations in open-circuit voltage and fill-factor that are caused by structural defects by passivating these defects using a hydrogenation process.
- Research Organization:
- Solarex Corp., Rockville, MD (USA); Jet Propulsion Lab., Pasadena, CA (USA)
- OSTI ID:
- 5909282
- Report Number(s):
- N-85-10446; NASA-CR-173838; JPL-9950-935
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFECTS
DIRECT ENERGY CONVERTERS
ELECTRIC POTENTIAL
ELEMENTS
EQUIPMENT
FABRICATION
GRAIN BOUNDARIES
HYDROGENATION
MATERIALS
MICROSTRUCTURE
PASSIVATION
PASSIVITY
PERFORMANCE
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
POLYCRYSTALS
SEMIMETALS
SILICON
SILICON SOLAR CELLS
SOLAR CELLS
SOLAR EQUIPMENT