Optical and Structural Study of Organometal Halide Materials for Applications in Perovskite-Based Solar Cells

CH3NH3PbI3 and CH3NH3PbI2Br crystal powders and thin films with chemical formula CH3NH3PbI3−x 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 CH3NH3PbI3−x 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.