Used in the fabrication of perovskite solar cells as a surface passivation agent to improve device efficiency and stability. It helps suppress non-radiative recombination at grain boundaries and interfaces by passivating defects in the perovskite layer. Also employed in the development of light-emitting diodes (LEDs) and photodetectors due to its ability to enhance optoelectronic properties. Its bulky organic cation structure aids in forming low-dimensional perovskite phases, which can tune bandgap and improve moisture resistance in optoelectronic devices.