Abstract
The results of a new approach to utilize metallurgical grade (MG) silicon powder to obtain polycrystalline silicon wafers for the fabrication of solar cells are reported. A polycrystalline silicon tube is filled with MG silicon powder and is used as a consumable container which facilitates the float zone melting of the powder. This leads to the dilution of impurities in the melt; an in situ purification of the melt also takes place during solidification. This method has given an air mass one conversion efficiency of about 4.3% in cells 2 cm 2 in area and there is significant scope for improvement in both the efficiency and the cell area.
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