Photoconductivity is the ability of a material to conduct electricity when exposed to light. This is due to the generation of free charge carriers (electrons and holes) when the material absorbs photons of light.
Photoresistors, also known as light-dependent resistors, work by changing their resistance in response to light. When light shines on the photoresistor, more charge carriers are generated, which increases the conductivity of the material and decreases its resistance.
Photoconductivity and photoresistors have a wide range of applications, including light sensors in cameras, automatic lighting control, and solar cells. They are also used in photocopiers, barcode scanners, and light meters.
The wavelength of light can affect photoconductivity as different materials have different absorption spectra. This means that certain materials may have a higher photoconductivity at specific wavelengths of light, while others may not be affected at all.
Yes, photoconductivity can be controlled by adjusting the intensity and wavelength of the light source. Additionally, the use of materials with different bandgap energies can also control the level of photoconductivity. This allows for the customization of photoresistors for specific applications.