Bismuth(III) sulfide is primarily used in the production of bismuth-based semiconductors, which are essential in thermoelectric devices. These devices convert heat into electricity, making them valuable in energy recovery systems and cooling applications. Additionally, it is employed in the manufacturing of photodetectors and infrared sensors due to its ability to detect and respond to light in the infrared spectrum. In the cosmetics industry, it is utilized as a pigment in certain formulations, providing a pearlescent or metallic effect. Bismuth(III) sulfide also finds application in lubricants, where it enhances performance under high-pressure conditions. Furthermore, it is studied for its potential use in photocatalytic processes for environmental cleanup, such as breaking down pollutants in water.