Silicon halide--alkali metal flames as a source of solar grade silicon. Fourth quarterly report, March 1--May 31, 1978

Technical Report · Thu Jun 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6565177· OSTI ID:6565177

Olson, D B; Miller, W J

This program is designed to demonstrate the feasibility of using alkali metal-silicon halide diffusion flames in a process for producing large quantities of solar cell grade silicon at low cost. Na + SiCl/sub 4/ flow tube experiments were completed under a variety of conditions of pressure, reactor temperature, and flow velocity. Comparative experiments using 300 K Ar and 1000 K H/sub 2//Ar diluents were performed with few differences in deposition rates or product characteristics found. Silicon from both sets of experiments was found to contain small amounts of Fe and other metal impurities. A Na + SiF/sub 4/ experiment, run in an unheated reactor tube, was found to produce a large fraction of Na/sub 2/SiF/sub 6/, with only a small yield of Si.

• Research Organization: Aerochem Research Labs., Inc., Princeton, NJ (USA)
• DOE Contract Number: NAS-7-100-954777
• OSTI ID: 6565177
• Report Number(s): DOE/JPL/954777-4; AeroChem-TN-192
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
ALKALI METAL COMPOUNDS
ALKALI METALS
ARGON
CHEMICAL PREPARATION
CHEMICAL REACTORS
CHLORIDES
CHLORINE COMPOUNDS
CRYOGENIC FLUIDS
DIFFUSION
DIRECT ENERGY CONVERTERS
ELEMENTS
FEASIBILITY STUDIES
FLAMES
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN
IMPURITIES
IRON
METALS
NONMETALS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
POTASSIUM
RARE GASES
SEMIMETALS
SILICON
SILICON CHLORIDES
SILICON COMPOUNDS
SILICON FLUORIDES
SILICON SOLAR CELLS
SODIUM
SODIUM COMPOUNDS
SODIUM FLUORIDES
SOLAR CELLS
SYNTHESIS
TRANSITION ELEMENTS