| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Research Abstract |
Si manufacturing process for solar cells now composes of the reduction of highly purified trichlorosilane made from the metal Si. Metal Si is obtained by the reduction of Silica stone. high grade SiO_2 which got the target crystal Si manufacturing method from silica sands by this research from The production process we proposed in this research is the direct reduction from high purity silica to solar grade silicon. It is the innovative energy-saving process of manufacturing the solar grade Si.
The purpose of this research is to analyze the flow of the thermodynamic equilibrium of the elementary process of this process, a rate of reaction, and gas in detail by an experiment and calculation, and to acquire knowledge required for the mechanical design of a process and a reduction reactor. The raw silicon oxides are reduced to silicon through various by-products, with carbon. It is indispensable to control this by-product for improvement of the yield of a reduction process.
Because silicon is only generated from by-products, SiO and SiC, reaction control of the by-products is important. According to thermodynamic calculation, by the reaction process of this SiO and SiC, when carbon existed, it turned out that SiC is always generated preferentially. Finally, we obtained silicon by induction-heating method, with precisely controlling carbon consumption, and the production and consumption of SiC.
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