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

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

Right Answer is:

Germanium junction photo-conductive cell

SOLUTION

  • Photo-conductive cells, in which an incident photon removes an electron from the valence band into the conduction band.
  • The value of the forbidden energy gap sets a long wave limit to the sensitivity of the photocell.
  • A photoconductive cell appears as a linear resistance, which decreases with increased illumination.
  • Photo-conductive diodes operate with a reverse voltage of up to 100 V.
  • The germanium junction photodiode has a maximum sensitivity of about 30mA/lumen at a light wavelength of 1.6 µ (or 16,000 A).
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