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A cell in which a semiconductor having a negative illumination coefficient of resistance is used is known as ________.

  • A cell in which a semiconductor having a negative illumination coefficient of resistance is used is known as a Photo-conductive cell.
  • A photoconductive cell, also known as a photoresistor, is a type of light-sensitive semiconductor device that exhibits a negative coefficient of resistance.
  • This means that as the intensity of incident light increases, the resistance of the device decreases.
  • Photoconductive cells are made of materials such as cadmium sulfide (CdS) or lead sulfide (PbS), which are known as photoconductive materials.
  • These materials have a high resistance in the absence of light, but when light is incident upon them, they absorb photons and generate electron-hole pairs, which lowers the resistance of the material.
  • This change in resistance can be detected and measured and is often used as a means of sensing or detecting light.
  • Photoconductive cells have a wide range of applications, including in photographic light meters, automatic lighting controls, and optical communications.
  • They are also used in some types of solar cells, where they serve as light-absorbing material that converts incident light into electrical energy.