8MORITA K, M1KI T. Thermodynamics of solar grade silicon ref'ming[J]. IntermetaUicsll, 2003, 11: 1111-1117.
9WODITSCHA P, KOCH W. Solar grade silicon feedstock supply for PV industry[J]. Solar Energy Materials & Solar Cells, 2002, 72(1): 11-26.
10PIRES J C S, BRAGA A F B, MEI P R. The purification of metallurgical grade silicon by electron beam melting[J]. Journal of Materials Processing Technology, 2005, 169(1): 16-20.