| Budget Amount *help |
¥44,850,000 (Direct Cost: ¥34,500,000、Indirect Cost: ¥10,350,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2018: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2017: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2016: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
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| Outline of Final Research Achievements |
We studied a low-energy, low-cost, and high-productivity method to produce silicon for solar cells from high-purity silica. The electrochemical reduction method in molten salt was adopted as an alternative to the conventional carbothermic reduction, and the following results were obtained. (1) The mechanism of electrochemical reduction of SiO2 on liquid Zn electrode in molten CaCl2 was investigated. As the results of electrochemical measurement and sample analysis, we found that there existed a potential region where Zn-Si alloy was formed directly and a potential region where Zn-Si alloy was formed indirectly via Zn-Ca alloy. (2) Si precipitation from liquid Zn-Si alloy was investigated, which revealed that metallic impurities could be efficiently removed.
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