Through chemical synthesis and a high-pressure post-synthesis treatment using a diamond anvil cell and cutting-edge structural/physical property measurements, the project will advance material discovery by creating improved materials. The research group will prepare lead-free hybrid molecular ferroelectrics (LFHMFs) derived from flexible inorganic anions and a light cationic moiety using a facile solution chemistry approach. Given the characteristics of LFHMFs observed thus far, it appears that their development has reached a plateau. A distinctive approach to addressing this issue involves the use of pressure to alter the characteristics of existing LFHMFs. Pressure is an effective and clean post-synthesis tool for the elegant reshaping of LFHMFs, used to accurately regulate their crystal lattice and electronic behavior with atomic-level knowledge, leading to tuned key material properties. The narrowing of the band gap, carrier-lifetime prolongation, photoluminescence intensity enhancement, ambient-memorized retainability, metallization, amorphization, and phase transitions are features that expand the application possibilities of hybrid molecular ferroelectrics (HMFs), but have so far been mainly reserved for the well-studied lead-containing HMFs, which are toxic and intrinsically suffer from severe stability issues. As a result, it is critical to get a better understanding of the link between structure and property in LFHMFs and connect the best and most stable materials' properties with specific structural information. This is of crucial importance not only for fundamental scientific research but also for practical applications, as the development of lead-free, hybrid, switchable materials with non-toxic or less toxic components while maintaining excellent long-term functionality is currently one of the greatest challenges in the field of photovoltaics.