| 摘要 |
<p>Relatively pure Si (having less than about 1 ppm of detrimental impurities therein) is obtained from ordinary quartz sand by uniformly admixing such sand with suitable glass-forming materials, such as boron oxide and alkali-metal carbonates or oxides, melting such admixture to form a glass, annealing the glass so as to obtain a phase separation comprised of an SiO2rich phase and an impurity-rich phase, extracting the impurityrich phase via strong acid, such as nitric acid, washing and drying the remaining glass and reducing such glass with carboncontaining compounds, such as graphite, sucrose, starch, etc., in an electric arc. The so-obtained relatively pure silicon is suitable for fabrication into semiconductor components, such as solar cells.</p> |
