The production status of solar grade silicon and development studies of its new representative processes and technologies were comprehensively introduced.

Research on Metallurgical Purifying Method of Solar Grade Multicrystalline Silicon

More and more attentions have been paid to the research of producing solar grade silicon by refining metallurgical grade silicon.

A new way using optical fiber wastes as raw material for the preparation of electrolytic reduction of solid SiO2 to Si in molten chlorides was proposed to be a considerable technology to prepare solar grade silicon (SOG-Si).

In order to prepare solar grade silicon(SOG-Si) by removing impurities from metallurgical grade silicon(MG-Si),basing on the difference of aluminum solubility in the solid phase and the liquid phase during the solidification of MG-Si,the impurity aluminum is removed from MG-Si by directional solidification in this paper.

It was discovered that open-circuit voltage decay in multicrystalline silicon solar cells was smaller than that of monocrystalline silicon solar cells after electron irradiation (1MeV with dose of 1 × 1014 cm-2, 1 × 1015 cm-2, 1 × 1016 cm-2).

It is necessary to research and develop a production process for solar grade silicon, which is of low cost and independent of electronic industry, in order to meet rapid market demand of solar cells in the world.

A lot of researches show that the efficiency can reach 80% of single crystal silicon, by using solar grade silicon with purity of 4N to 6N for solar cell fabrication,but the cost only a quarter of that.