Abstract

• Methyl ammonium lead iodide perovskite films were fabricated by using two-step deposition method. PbI2 film was coated by using spin coating method. Making a high quality PbI2 film was easier and better to fabricate a good perovskite film.The spin coating rate, the concentration of the solution and the dipping time was varied to analyze the properties of the perovskite films. The structure of the methyl ammonium lead iodide perovskite films was analyzed by using XRD characterization. The color change of the films at different stages and the mesoporous structure of the film in two-step deposition method were evaluated. The morphology of the perovskite film was characterized by scanning electron microscopy (SEM). The band-gap of the film was analyzed to determine the parameter of the photovoltaic performance of the solar cell by using UV measurement. Finally, the combination of light harvesting layer methyl ammonium lead iodide perovskite film and electron transporting layer TiO2 film was summarized for perovskite solar cell performance.