fotokonduktiiviset

Fotokonduktiiviset refers to a property of certain materials where their electrical conductivity increases when exposed to light. This phenomenon is known as photoconductivity. When photons, the particles of light, strike a photoconductive material, they can excite electrons within the material's atomic structure, freeing them from their bound states. These freed electrons, along with the corresponding holes they leave behind, can then move freely, thus increasing the material's electrical conductivity. The greater the intensity of the incident light, the more photons are absorbed, and generally, the higher the conductivity becomes.

The magnitude of the photoconductive effect depends on the material's properties, including its band gap, the wavelength of the light, and its intensity. Materials like silicon, cadmium sulfide (CdS), and selenium are well-known for their photoconductive properties. This characteristic makes them useful in a variety of applications. Photoconductive devices are commonly found in light sensors, such as those used in automatic streetlights, cameras, and solar cells. They are also employed in photodetectors, which convert light signals into electrical signals, and in photocopiers and laser printers as part of the imaging process. The sensitivity and response time of a photoconductive material are critical factors in determining its suitability for specific electronic applications.