Formamidinium lead chloride iodide is primarily used in the development of perovskite solar cells due to its excellent light absorption properties and high charge carrier mobility. It enhances the efficiency and stability of these solar cells, making them more viable for commercial use. Additionally, this material is being explored in optoelectronic devices, such as light-emitting diodes (LEDs) and photodetectors, due to its tunable bandgap and superior optoelectronic performance. Its application in these fields contributes to advancements in renewable energy and next-generation electronic devices.