Abstract

• Structure and optical characterization of organic-inorganic methyl ammonium lead bromide film was fabricated by using spin coating and dipping two-step deposition method. The humidity and temperature effect were characterized to improve the morphology of the perovskite film. To verify the thickness of the film and properties, the spin coating rate, dipping solution concentration and annealing temperature were varied. The consistency with mesoporous structure and the color changes of the film at different stages were initialized. The structure of organic- inorganic lead bromide film was analyzed by using XRD characterization. The nano-range grain size and morphology of the perovskite film were characterized by measuring scanning electron microscopy (SEM). The UV measurement was performed to determine the band-gap of the film to justify the parameter of the photovoltaic performance of the solar cell. Finally, the properties of methyl ammonium lead bromide perovskite film and TiO2 film were optimized by varying the thickness of the TiO2 film for high efficiency solar cell performance.