Tin(II) iodide is primarily used in research and specialized chemical synthesis. It serves as a precursor in the preparation of other tin-containing compounds and is utilized in the development of semiconductor materials. Due to its luminescent properties, it has been studied for potential applications in optoelectronic devices, such as light-emitting diodes (LEDs) and sensors. It also finds use as a reagent in organic transformations, particularly in catalysis and in the formation of carbon-halogen bonds. In addition, Tin(II) iodide is employed in the fabrication of perovskite-type materials for solar cell research, where it acts as a source of tin in thin-film deposition processes. Its role in low-temperature chemistry and solution-based processing makes it valuable in emerging energy technologies.