Improved Crystallization and Optical Performance of Mixed Ruddlesden-Popper Perovskite

Ruddlesden-Popper perovskites have recently been a hot topic due to their high stability and excellent optoelectronic performances. Different cation substitution endows the structures with other properties. Here, an in-depth theoretical model has been proposed to analyze the effect of cation amount on electronic structure. Accordingly, a series of quasi-two-dimensional lead halide perovskite single crystals have been prepared by combining vapor and solution methods at room temperature. The effect of cations on optoelectronic devices was studied by analyzing the photocurrent of the photodetectors. The results show that the addition of cationic methylamine can result in devices with superior performance. These results enhance our understanding of the regulation of cations in materials and contribute to the fabrication of optoelectronic devices with better performance.