Inverted perovskite solar cells with high fill-factors featuring chemical bath deposited mesoporous NiO hole transporting layers

Mesoporous nickel oxide films deposited by chemical bath deposition have been used as hole transporting layers in inverted perovskite solar cells. Compared to planar spray deposited NiO-based devices, the scaffolded NiO films exhibit an improved interface between the perovskite and NiO layer, which facilitates reduced recombination dynamics. As a result, these facile scaffolds have enabled perovskite devices with average efficiencies of ~16% and remarkably high fill-factors of up to 0.85.215