Formamidinium iodide is widely used in the development of perovskite solar cells, where it serves as a key precursor for formamidinium lead iodide perovskite materials. These materials are known for their excellent light absorption properties and thermal stability, making them highly efficient for photovoltaic applications. Additionally, it is utilized in the synthesis of other organic-inorganic hybrid materials, which are explored for optoelectronic devices such as light-emitting diodes (LEDs) and photodetectors. Its role in advancing renewable energy technologies underscores its significance in modern materials science.