| Summary: | The power conversion efficiency (PCE) of an Ag/spiro-OMeTAD/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPbI<sub>3</sub>)/PCBM/mesoporous TiO<sub>2</sub>/compact TiO<sub>2</sub>/FTO planar solar cell with different annealing temperatures of PbI<sub>2</sub> and MAPbI<sub>3</sub> films was investigated in this study. The morphology control of a MAPbI<sub>3</sub> thin film plays key roles in high-efficiency perovskite solar cells. The PbI<sub>2</sub> films were prepared by using thermal vacuum evaporation technology, and the MAPbI<sub>3</sub> perovskite films were synthesized with two-step synthesis. The X-ray spectra and surface morphologies of the PbI<sub>2</sub> and MAPbI<sub>3</sub> 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<sub>oc</sub>) was 0.965 V, the short-circuit current (J<sub>sc</sub>) was 13.6 mA/cm<sup>2</sup>, and the fill factor (FF) was 0.66 by scanning the density–voltage (J–V) curve.
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