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Question 20226
JEE Physics · Medium

Semiconductors: Photodiode MCQ

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PhotodiodeMediumQuestion 20226

Question

A photodiode is operated in:
  1. A
    Forward bias for detection
  2. B
    Reverse bias for detection
    Correct
  3. C
    Zero bias only
  4. D
    Both forward and reverse for maximum sensitivity

Correct answer

Reverse bias for detection

Explanation

In reverse bias: the large depletion region allows more photon absorption. Incident light creates electron-hole pairs that are swept by the field → reverse current increases proportionally with light intensity. Used in optical communication receivers, CDs, remote controls.

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