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External quantum efficiency (EQE) response of bare silicon solar cell, cell coated with a 250-nm thick layer of SiO2, and cells coated with a SiO2 layer that included three species of Eu-doped phosphors at various weight ratios (0.5:1:1.5, or 1:1:1, or 1.5:1:0.5 in wt %).
