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- W2074142667 abstract "A solution to the problem of the shortage of silicon feedstock used to grow multicrystalline ingots can be the production of a feedstock obtained by the direct purification of upgraded metallurgical silicon by means of a plasma torch. It is found that the dopant concentrations in the material manufactured following this metallurgical route are in the 1017 cm−3 range. Minority carrier diffusion lengths Ln are close to 35 μm in the raw wafers and increases up to 120 μm after the wafers go through the standard processing steps needed to make solar cells: phosphorus diffusion, aluminium–silicon alloying and hydrogenation by deposition of a hydrogen-rich silicon nitride layer followed by an annealing. Ln values are limited by the presence of residual metallic impurities, mainly slow diffusers like aluminium, and also by the high doping level." @default.
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- W2074142667 date "2008-10-01" @default.
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- W2074142667 title "Multicrystalline silicon wafers prepared from upgraded metallurgical feedstock" @default.
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- W2074142667 doi "https://doi.org/10.1016/j.solmat.2008.04.020" @default.
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