Abstract
A combination of a mesoporous brookite layer prepared at 150 °C and an ultrathin sputtered compact TiO2 layer was employed as an electron collector of CH3NH3PbI3−xClx perovskite solar cells on an indium tin oxide-polyethylene naphthalate (ITO-PEN) plastic film. The significant contribution of the 8 nm-thick compact layer on ITO to suppressing recombination was clarified; this contribution resulted in a high power conversion efficiency of up to 13.8%.
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