Organometal Halide Perovskite CHNHPbI as an Effective Photosensitizer for p-Type Solar Cells

CH 3 NH 3 PbI 3 sensitizers are prepared with different mixed solvents. Using butyrrolactone/dimethyl sulphoxide mixed solvent, a smooth film with roughness of 12 nm is obtained. The prepared CH 3 NH 3 PbI 3 are used as photosensitizers of p-DSSC. Photoelectrical performance indicates that CH 3 NH 3 PbI 3 with butyrrolactone/dimethyl sulphoxide presents a higher J sc of 7.5 mA cm -2 and a higher efficiency of 0.53%, which may contribute to its improved UV-vis absorption and smooth film. Researches further indicate that CH 3 NH 3 PbI 3 with butyrrolactone/dimethyl sulphoxide provides fast hole transport, less recombination and improved hole collection efficiency.