Used as a precursor in the synthesis of perovskite materials for solar cells, particularly in the development of two-dimensional hybrid perovskites. Its ionic structure helps stabilize the perovskite lattice, improving moisture resistance and device longevity. Also employed in electrochemical applications due to the thermal and chemical stability provided by the tetrafluoroborate anion. Serves as a phase-transfer catalyst in organic reactions and finds use in ionic liquids for green chemistry processes.