Used in the fabrication of perovskite solar cells as a key precursor for depositing light-absorbing perovskite layers. It reacts with lead iodide to form methylammonium lead iodide, which exhibits excellent photovoltaic properties such as high absorption coefficient and charge carrier mobility. Also employed in research for optoelectronic devices like light-emitting diodes and photodetectors due to its tunable bandgap and solution processability. Its role in enabling low-cost, solution-based manufacturing makes it valuable in developing next-generation solar energy technologies.