Photodiode is operated:
Correct answer: D. Both (a) and (c)
- A. In the reversed biased situation
- B. In the forward biased situation
- C. With the light incident upon
- D. Both (a) and (c)
Explanation
The photodiodes are used in reverse bias condition because the change in reverse current through the photodiode due to change in light flux can be measured easily as the reverse saturation current is directly proportional to the light flux.A photodiode can be regarded as a high-impedance non-ohmic photosensitive device whose current is almost independent of applied voltage. The incident light falls on a reverse-biased semiconductor junction, and the separation of electrons from holes will allow the junction to conduct despite the reverse bias.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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