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Vanadium pentoxide (V2O5) was used as a novel blocking layer in dye-sensitized solar cells (DSCs), leading to a significant efficiency increase from 8.78% to 9.65%. The addition of V2O5 layer to nanocrystalline (nc)-TiO2 increased peak external quantum efficiency (EQE) from~80% to ~88–89%. Cyclic Voltammetry analysis indicated a positive shift of Fermi-level in case of TiO2/V2O5 based cells supported...