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(A) photodiode is operated in reverse bias mode. When light of energy greater than the bandgap energy falls on the photodiode,electron-hole pairs are

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increases initially and saturates finally

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(A) photodiode is operated in reverse bias mode. When light of energy greater than the bandgap energy falls on the photodiode,electron-hole pairs are generated in the depletion region. As the reverse biasing voltage is increased,the electric field in the depletion region increases,which helps in sweeping the generated charge carriers across the junction more effectively,thereby increasing the photocurrent. However,once all the generated charge carriers are collected,further increase in the reverse bias voltage does not increase the photocurrent significantly,and it reaches a saturation value. This is shown in the $I-V$ characteristic curve of a photodiode.

With increasing biasing voltage of a photodiode,the photocurrent magnitude

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