A method for manufacturing perovskite thin film is provided. The method includes: Preparing a lead-containing aqueous solution. Adding a polymer to the lead-containing solution to form a perovskite precursor solution, wherein a repeating unit of the polymer includes an oxygen atom, a sulfur atom or a nitrogen atom having at least one lone pair. Forming a lead-containing thin film with the perovskite precursor solution. Drying the lead-containing thin film. Soaking the lead-containing film in the iodine-containing solution, and a lead iodide film is formed after reaction. Soaking the lead iodide film in a mixed solution which includes methylamine chloride and methylammonium iodide, and the lead iodide film is reacted to form a methylamino lead iodide film. The invention also discloses a solar cell with the aforementioned methylamino lead iodide thin film. |