PSC(perovskite solar cells)are considered the promising third-generation photovoltaic cells with the potential to replace silicon-based cells.However,the uncontrolled crystallization process during the preparation of perovskite thin films hinders its large-scale production and commercialization progress.As a result,a two-step sequential deposition method of lead iodide and methylammonium iodide films was proposed.The film quality was largely dependent on the morphology of the lead iodide layer deposited in the first step.To investigate high-quality lead iodide film fabrication methods,the morphology changes of lead iodide films in a high-humidity environment were observed,and the crystal quality of lead iodide films before and after the experiments was compared.It is found that water vapor plays a regulating role in the morphology of lead iodide films.The experimental results indicate that there is a certain chemical interaction between water vapor and lead iodide crystals,leading to the recrystallization of lead iodide.In a high-humidity environment,the appropriate exposure time can improve the lead iodide film,providing insights for enhancing the quality of perovskite thin films.
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