A simple, low-cost modified drop-casting method to develop high-quality CH3NH3PbI3 perovskite thin films

To make perovskite solar cells competitive and efficient, it is necessary to control the crystallinity along with full coverage of the used substrate. Nowadays, numerous techniques have applied to improve and control the crystallinity of fabricated perovskite films, but still, have the most critical issue for perceiving high-performance perovskite solar cells. Herein, a low-cost yet effective procedure has used to fabricate thin-films of methylamine lead halide (CH3NH3PbI3) perovskite semiconductor. Uniform and high-quality CH3NH3PbI3 perovskite thin films were successfully fabricated on a glass substrate using a modified drop-casting method. Morphological characterization has shown an extremely compact, highly crystalline, and dense microstructure pinhole-free thin-film without any impure phase. Compared to the spin coating method, thin-films processed have been exposed to retain an enhanced film quality with higher crystallinity. Furthermore, a voltage-current characteristic has shown that the photoconductivity significantly enhanced the films processed with this versatile method. These results were also validated by absorbance and photoluminescence measurements. Achieved results highlight the significance of this low-cost method for forthcoming high-performance photovoltaic devices based on CH3NH3PbI3 semiconductor thin films.