Photoconductive materials are substances that change their electrical conductivity when exposed to light. When light photons hit these materials, they excite electrons, allowing them to move more freely. This increase in electron mobility results in a higher electrical conductivity, making photoconductive materials useful in various applications. Common examples of photoconductive materials include cadmium sulfide and lead sulfide. These materials are often used in devices like photodetectors and solar cells, where their ability to convert light into electrical signals is essential for functionality.