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The power conversion efficiency (PCE) of an Ag/spiro-OMeTAD/CH₃NH₃PbI₃ (MAPbI₃)/PCBM/mesoporous TiO₂/compact TiO₂/FTO planar solar cell with different annealing temperatures of PbI₂ and MAPbI₃ films was investigated in this study. The morphology control of a MAPbI₃ thin film plays key roles in high-efficiency perovskite solar cells. The PbI₂ films were prepared by using thermal vacuum evaporation technology, and the MAPbI₃ perovskite films were synthesized with two-step synthesis. The X-ray spectra and surface morphologies of the PbI₂ and MAPbI₃ films were examined at annealing temperatures of 80, 100, 120, and 140 °C for 10 min. The performance of the perovskite planar solar cell at an annealing temperature of 100 °C for 10 min was demonstrated. The power conversion efficiency (PCE) was about 8.66%, the open-circuit voltage (V_oc) was 0.965 V, the short-circuit current (J_sc) was 13.6 mA/cm², and the fill factor (FF) was 0.66 by scanning the density–voltage (J–V) curve.