Silicon-ingot casting: heat-exchanger method (HEM); multi-wire slicing: fixed-abrasive slicing technique (FAST). Phase III and Phase IV. Silicon sheet-growth development for the large-area sheet task of the Low-Cost Solar-Array Project. Final report, December 15, 1978-June 30, 1981
It has been demonstrated that directional solidification by the Heat Exchanger method (HEM) is a viable approach for directional solidification of silicon ingots to be used for terrestrial solar cell applications. Some of the significant advances made during this phase of the program are listed. Some of the problems encountered have been growth rate decrease with increased ingot height, silicon carbide precipitates, and high dislocation density in HEM material. The silicon carbide is attributed to backstreaming of oil vapors from the vacuum pump; the high dislocation density is associated with the thermal history of the boule. Using solar metallurgical meltstock nearly single crystal structure has been achieved with one HEM directional solidification. Solar cells fabricated using this meltstock have shown up to 12.33% conversion efficiency. The projected add-on cost of HEM processing using the best simultaneous achievements is $17.39/m/sup 2/ - well within the allocation of $18.15/m/sup 2/ for 1986 goals.
- Research Organization:
- Crystal Systems, Inc., Salem, MA (USA)
- DOE Contract Number:
- NAS-7-100-954373
- OSTI ID:
- 6396141
- Report Number(s):
- DOE/JPL/954373-81/19; ON: DE83007035
- Resource Relation:
- Other Information: 4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Silicon ingot casting - heat exchanger method (HEM); multi-wire slicing - fixed abrasive slicing technique (FAST). Phase IV. Silicon sheet growth development for the Large Area Sheet Task of the Low-Cost Solar Array Project. Quarterly progress report No. 4, October 1-December 31, 1980
Silicon ingot casting: heat exchanger method (HEM). Multi-wire slicing: fixed abrasive slicing technique (FAST). Phase IV. Silicon sheet growth development for the large area sheet task of the low-cost solar array project. Quarterly progress report No. 3, July 1, 1980-September 30, 1980
Related Subjects
36 MATERIALS SCIENCE
SILICON
CASTING
CUTTING
SILICON SOLAR CELLS
FABRICATION
COST
EFFICIENCY
ELECTRIC CONDUCTIVITY
SILICON CARBIDES
CARBIDES
CARBON COMPOUNDS
DIRECT ENERGY CONVERTERS
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
MACHINING
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
SEMIMETALS
SILICON COMPOUNDS
SOLAR CELLS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion
360601 - Other Materials- Preparation & Manufacture