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(a) IV curves of the ZnO NWs CH3NH3PbI3 perovskite solar cell on flexible substrate; (b) IQE spectra of the corresponding flexible solar cell; (c) SEM cross section of the flexible ZnO NWs CH3NH3PbI3 perovskite solar cell; (d) Stability of the flexible solar cell under bending. The bending radius is 1.2 cm. Inset: image showing typical, flexible ZnO NWs CH3NH3PbI3 perovskite solar cell.
