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Which cell has the highest sensitivity (current per unit of luminous flux)?

  • Germanium junction photo-conductive cells have the highest sensitivity.
  • Germanium is a semiconductor material that has a narrow bandgap, which allows it to absorb a wide range of wavelengths of light, from visible to near-infrared.
  • When light is absorbed by the germanium material, it creates electron-hole pairs, which can generate a photocurrent.
  • Germanium junction photo-conductive cells have high sensitivity to light, and are commonly used in scientific instruments and in telecommunications applications, where their high sensitivity to infrared light is useful for detecting optical signals in fiber-optic networks.