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Titanium dioxide (TiO2) with dispersed W-doping shows its capability for efficient electron collection from perovskite to TiO2 in perovskite solar cell. The conduction band (CB) of TiO2 moves downward (positive shift) with increasing the tungsten (W) content, which enlarges the energy gap between the CB of TiO2 and the perovskite. Thus, the efficiency of electron injection from perovskite to TiO2...
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