Development of a model and computer code to describe solar grade silicon production processes. First quarterly report
It is proposed to develop a mathematical model and a computer code based on this model, which will allow prediction of the product distribution in chemical reactors in which gaseous silicon compounds are converted to condensed-phase silicon. The reactors to be modeled are flow reactors in which silane or one of the halogenated silanes is thermally decomposed or reacted with an alkali metal, H/sub 2/ or H atoms. Because the product of interest is particulate silicon, processes which must be modeled, in addition to mixing and reaction of gas-phase reactants, include the nucleation and growth of condensed Si via coagulation, condensation, and heterogeneous reaction. The most recent version of a free shear layer turbulent mixing code (LAPP) which treats finite rate, gas-phase chemistry has been acquired and documented to ascertain exactly the numerous changes the code has undergone in recent years. Equations describing particle dynamics have been formulated and are being coded. A code for calculating particle coagulation rates is available; it will be recoded, combined with a nucleation model, and inserted into the LAPP code. A model for calculating nucleation rates has been selected from among several alternatives; the rate coefficients and thermochemical information needed for its utilization are currently being developed.
- Research Organization:
- Aerochem Research Labs., Inc., Princeton, N.J. (USA)
- DOE Contract Number:
- NAS-7-100-954862
- OSTI ID:
- 6814701
- Report Number(s):
- DOE/JPL/954862-1; AeroChem-TN-184
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHEMICAL REACTORS
MATHEMATICAL MODELS
SILANES
CHEMICAL PREPARATION
SILICON
CRYSTAL GROWTH
PRODUCTION
BOUNDARY CONDITIONS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPUTER CODES
FORECASTING
L CODES
MIXING
NUCLEATION
SILICON SOLAR CELLS
THERMODYNAMIC PROPERTIES
VISCOSITY
DIRECT ENERGY CONVERTERS
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
KINETICS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
REACTION KINETICS
SEMIMETALS
SILICON COMPOUNDS
SOLAR CELLS
SYNTHESIS
140501* - Solar Energy Conversion- Photovoltaic Conversion