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With the help of necessary circuit diagr...

With the help of necessary circuit diagram explain the working of a photo diode used for detecting optical signals.

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The circuit diagram, for the photodiode, is shown here. Working: The photodiode is illuminated by optical signal, whose photon energy is greater than the energy gap of the semiconductor used. The electric field, at the junction, seperates the electrons and holes and thus gives rise to an emf. When an external load is connected, a (photo) current flows through it. The magnitude of this current is proportional to the intensity of light incident on the photodiode.
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