Photoconductive devices are materials that change their electrical conductivity when exposed to light. When light photons hit the material, they excite electrons, allowing them to move more freely and conduct electricity. This property makes photoconductive devices useful in various applications, such as light sensors and imaging systems. Common examples of photoconductive materials include cadmium sulfide and lead sulfide. These devices are often used in photodetectors, which convert light signals into electrical signals, enabling technologies like cameras and solar cells to function effectively. Their ability to respond to light makes them essential in modern electronics.