Polycrystalline silicon (PS) is the material of choice for photovoltaic (PV) applications. PS is the purest synthetic material on the market, though its processing carries high environmental risk. While many current optoelectronic applications require high purity, PV applications do not and alternate processes and materials are being explored for PV-grade silicon. It reviews current and potential future processing technologies for PV applications of solar silicon. It describes alternative processes and issues of material purity, cost, and environmental impact. It covers limits of silicon use with respect to high-efficiency solar cells and challenges arising from R&D activities.
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