Chemical wrapping for selective crystal formation using trapping light induction

In this research, we demonstrated how different products emerge from the same precursor solution based on experimental conditions, particularly laser trapping and thermal heating. Using a precursor solution of MACl and PbI₂ in a DMSO/DMF solvent, we observed that laser trapping selectively induces MAPbCl₃ crystallization, yielding a material with a 2.94 eV bandgap and dark blue emission at 440 nm. In contrast, thermal heating of the same solution leads to the formation of MAPbI₃ thin films, characterized by bright red emission at 800 nm. This phenomenon is attributed to chemical wrapping effects, where solvent interactions and thermochemical conditions influence the final product. The ability to control perovskite formation through external stimuli like laser trapping expands the possibilities for fine-tuning material properties for targeted applications. This research not only deepens our understanding of crystallization dynamics in hybrid perovskites but also paves the way for innovative techniques in precision material synthesis.