Hot forming of silicon sheet, silicon sheet growth development for the Large Area Silicon Sheet Task of the Low Cost Silicon Solar Array Project. Final report, May 12, 1976--August 11, 1977
Results of an experimental program investigating the hot workability of polytextuerystalline silicon are reported. Uniaxial stress-strain curves are given for strain rates in the range of 10/sup -5/ to 10/sup 1/ sec/sup -1/ and temperatures from 1100 to 1380/sup 0/C. At the highest strain rates at 1380/sup 0/C axial strains in excess of 20% were easily obtainable without cracking; although special preparation of the compression platens allows strains in excess of 50%. After deformations of 36%, recrystallization is completed within 0.1 hr at 1380/sup 0/C. When the recrystallization is ''complete,'' there is still a small volume fraction of unrecrystallized material which appears very stable and may degrade the electronic properties of the bulk material. Texture measurements show that the as-produced vapor deposited polycrystalline rods have a <110> fiber texture with the <110> direction parallel to the growth direction and no preferred orientation about this axis. Upon axial compression perpendicular to the growth direction the former <110> fiber axis changes to <111> and the compression axis becomes <110>. Recrystallization changes the texture to <110> along the former fiber axis and <100> along the compression axis.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE; Jet Propulsion Laboratory
- DOE Contract Number:
- NAS-7-100-954506
- OSTI ID:
- 7043827
- Report Number(s):
- DOE/JPL/954506-1
- Country of Publication:
- United States
- Language:
- English
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Hot forming of silicon sheet, silicon sheet growth development for the large area silicon sheet task of the Low Cost Silicon Solar Array Project. Quarterly report No. 3, September 24--December 24, 1976
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Related Subjects
36 MATERIALS SCIENCE
SILICON
DIFFUSION LENGTH
HOT WORKING
MECHANICAL PROPERTIES
RECRYSTALLIZATION
ANNEALING
DEFORMATION
POLYCRYSTALS
PRODUCTION
ROLLING
SHEETS
SILICON SOLAR CELLS
STRAINS
STRESSES
TEXTURE
VAPOR DEPOSITED COATINGS
COATINGS
CRYSTALS
DIRECT ENERGY CONVERTERS
ELEMENTS
FABRICATION
HEAT TREATMENTS
MATERIALS WORKING
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SOLAR CELLS
140501* - Solar Energy Conversion- Photovoltaic Conversion
360603 - Materials- Properties