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The path to cost-effective high efficiency silicon solar cells begins with polysilicon material.The quality of the polysilicon that is used to manufacture the wafers directly affects the performance of the solar panels and therefore the cost per watt of the end product.Since the increase in cell performance is one path to increase the competitiveness of solar in an unsubsidized market,it is important to understand the impact of all raw materials.Access to cost-effective,high quality polysilicon is important,independent of cell structure and crystallization method,in order to support high efficiency solar cells.Many of the new high efficiency solar cells are based upon N-type cell structures.Since the minority carrier of an N-type cell is different than a P-type cell,it is sensitive to different impurities at various concentrations.A review of recent research on the impact of different impurities in N-type solar wafers will be presented.The effect of these impurities with different crystallization methods will also be discussed.