Photodiodes are mostly operated in reverse bi | vedclass

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Question

(C) In a photodiode, the reverse saturation current is primarily due to the flow of minority charge carriers. When light is incident on the photodiode

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Fractional change in minority carriers produces higher reverse current

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(C) In a photodiode, the reverse saturation current is primarily due to the flow of minority charge carriers. When light is incident on the photodiode, it generates electron-hole pairs, which increases the number of minority charge carriers. Because the initial number of minority carriers is very small, even a small amount of incident light causes a significant fractional change in their concentration. This leads to a noticeable change in the reverse current, making the photodiode highly sensitive to light. In contrast, in forward bias, the current is dominated by majority carriers, which are already present in large numbers, making the fractional change due to incident light negligible.

Photodiodes are mostly operated in reverse biased condition because

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