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Back surface passivation becomes a key issue for the silicon solar cells made with thin wafers. The high surface recombination due to the metal contacts can be lowered by reducing the back contact area and forming local back surface field (LBSF) in conjunction with the passivation with dielectric layer. About 3×10-7m thick porous silicon (PS) layer with pore diameter mostly of 1×10-8–5×10-8m was formed...
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