Br crystal powders and thin films with chemical formula CH 3 NH 3 PbI 3Àx Br x have been synthesized by reacting methylammonium bromide/iodide with lead iodide. The films were fabricated by a low-temperature solution process using the spin-coating method followed by thermal annealing, which is an effective means for controlling the composition and morphology of the CH 3 NH 3 PbI 3Àx Br x thin films. The resulting perovskite films exhibit good optical absorption and crystalline structure, being promising for potential application as light absorbers in future solar cells.
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