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With increasing biasing voltage of a photodiode, the photocurrent magnitude : (1) increases initially and saturates finally (2) increases initially and after attaining certain value, it decreases (3) increases linearly (4) remains constant

1. increases initially and saturates finally
2. increases initially and after attaining certain value, it decreases
3. increases linearly
4. remains constant

Correct answer: increases initially and after attaining certain value, it decreases

Solution

As the biasing voltage of a photodiode increases, the photocurrent initially rises due to enhanced carrier collection. However, after reaching a certain voltage, the current begins to decrease due to effects like increased recombination and saturation, leading to a decline in the photocurrent.

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