Used in perovskite solar cells as a key precursor for high-efficiency light-absorbing layers. It enables the formation of stable formamidinium-based perovskite structures, which offer broader light absorption and better thermal stability compared to methylammonium counterparts. Commonly blended with other halides to tune bandgap energy, making it essential for tandem solar cells and next-generation photovoltaic devices. Also explored in light-emitting diodes (LEDs) and photodetectors due to its excellent optoelectronic properties.