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Photocurrent

The electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power.

The photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power.

The photocurrent may occur as a result of the photoelectric, photoemissive, or photovoltaic effect.

The photocurrent may be enhanced by internal gain caused by interaction among ions and photons under the influence of applied fields, such as occurs in an avalanche photodiode (APD).

As a characterization technique, photocurrent is commonly used to study charge properties such as excitons of semiconductor nanostructures and other light-absorbing materials

When suitable radiation is used, the photoelectric current

  • is directly proportional to the intensity of radiation.
  • increases with the increase in accelerating potential until the stage are reached when photo-current becomes maximum and does not increase with further increase in accelerating potential. The highest(maximum) value of the photo-current is called saturation current. The value of retarding potential at which photo-current becomes zero is called cut-off voltage or stopping potential for the given frequency of the incident ray.

Key Terms

definition
photocurrent
photodiode
photoelectric
photosensitive device
photovoltaic effect
power
result
result exposure
usage

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Acronymn

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Synonymns

Photocurrent
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Last modified on June 4 2020
Content adapted from Wikipedia
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