High-efficiency silicon solar cells for a 22-sun line-focus module
- Solarex Corp., Rockville, MD (USA). Aerospace Div.
The purpose of this program was for Solarex, a commercial silicon solar cell supplier, to demonstrate the capability of fabricating high efficiency 38.4 cm{sup 2} concentrator cells in a production environment. These cells were designed for use in 22-sun line-focus concentrator module that could generate 20 kW for the PVUSA EMT-1 project. The cells were fabricated using p-type, .8 ohm-cm silicon, randomly textured fronts, dual-layer anti-reflective coatings, passivated emitters, restricted emitter/metallization contact areas, and silver gridlines with large cross-sectional areas. Prismatic covers were used to eliminate losses from gridline shadowing. Cell efficiencies as high as 20.34% were demonstrated on covered cells at 20 suns air mass 1.5 illumination. The process sequence includes a single diffusion step, a thin thermal oxide growth, and two mechanically registered photolithography steps. 13 figs., 3 tabs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Solarex Corp., Rockville, MD (USA). Aerospace Div.
- Sponsoring Organization:
- DOE/CE
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6960501
- Report Number(s):
- SAND-90-7026; ON: DE90010242
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
141000 -- Solar Collectors & Concentrators
CHALCOGENIDES
COMPARATIVE EVALUATIONS
DESIGN
DIMENSIONS
DIRECT ENERGY CONVERTERS
EFFICIENCY
EQUIPMENT
FABRICATION
INTERFACES
MEASURING METHODS
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PRISMS
PROCESSING
QUANTUM EFFICIENCY
SOLAR CELLS
SOLAR CONCENTRATORS
SOLAR EQUIPMENT
TEMPERATURE EFFECTS
TESTING