Germanium(II) sulfide is primarily used in the field of optoelectronics due to its semiconductor properties. It is employed in the manufacturing of infrared optical materials, which are essential for devices like night-vision equipment and thermal imaging cameras. The compound is also utilized in the development of photodetectors and photovoltaic cells, where it helps in converting light into electrical energy efficiently. Additionally, Germanium(II) sulfide finds applications in the synthesis of other germanium compounds, which are used in various high-tech industries. Its ability to form thin films makes it valuable in coating technologies, enhancing the performance and durability of electronic components.