Abstract
A highly efficient PEN/ITO/ZnO/CH 3 NH 3 PbI 3 perovskite/PTAA/Au flexible planar solar cell with 1.1 V V oc , 18.7 mA cm −2 J sc , 75% FF, and 15.4% η for the forward scan direction and 1.1 V V oc , 18.7 mA cm −2 J sc , 76% FF and 15.6% η for the reverse scan direction under illumination of 1 Sun was demonstrated.

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