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Functionally graded nanocrystalline silicon powder, having varied bandgap. has been prepared using mechanical alloying technique. The solar grade (99.999% pure) nanocrystalline silicon (nc-Si) powder was ball milled in argon atmosphere in an attrition mill for 4 h to 20 h (4 h, 12 h and 20 h) to reduce crystallite size in it. The milled powder samples were then degassed, to remove entrapped gases,...
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