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Developing a feasible method for renewable energy generation has become a focus due to concerns over global warming and increased demand for energy. Among renewable energy sources solar energy has attracted the most attention but production scaling and rising costs are hurdles for photovoltaic technologies to compete with traditionally generated power. In so called \"second generation\"" solar cells CIGS and its related materials are utilized for the fabrication of low-cost and high-efficiency solar cells. However the continued supply of the rare metal indium in the mass production stage has created major concerns."
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