Question:
With increasing biasing voltage of a photodiode, the photocurrent magnitude :
With increasing biasing voltage of a photodiode, the photocurrent magnitude :
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A photodiode works in reverse bias; the photocurrent is limited by the number of photo-generated carriers, so it cannot rise indefinitely.
Updated On: Nov 5, 2026
- Increases initially and after attaining certain value, it decreases
- Increases linearly
- Increases initially and saturates finally
- Remains constant
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The Correct Option is C
Solution and Explanation
In a photodiode operated in reverse bias, light generates electron-hole pairs in the depletion region.
At low reverse bias, not all the generated carriers are swept across the junction, and increasing the bias collects more of them, so the photocurrent increases.
Once the bias is large enough that every photo-generated carrier is collected, the current depends only on the light intensity and stays constant (saturation current).
Hence the photocurrent increases initially and then saturates.
Answer: (3) Increases initially and saturates finally
At low reverse bias, not all the generated carriers are swept across the junction, and increasing the bias collects more of them, so the photocurrent increases.
Once the bias is large enough that every photo-generated carrier is collected, the current depends only on the light intensity and stays constant (saturation current).
Hence the photocurrent increases initially and then saturates.
Answer: (3) Increases initially and saturates finally
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