Statement -1: A photodiode operates in revers | vedclass

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(A) photodiode is a special purpose $p-n$ junction diode fabricated with a transparent window to allow light to fall on the diode. It is operated unde

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Statement $-1$ is true,Statement $-2$ is true,Statement $-2$ is the correct explanation of Statement $-1$.

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(A) photodiode is a special purpose $p-n$ junction diode fabricated with a transparent window to allow light to fall on the diode. It is operated under reverse bias conditions.When the photodiode is illuminated with light (photons with energy $hu > E_g$),electron-hole pairs are generated near the depletion region. Due to the electric field of the depletion region,electrons and holes are separated before they can recombine.In reverse bias,the current is primarily due to minority carriers. The fractional change in this small reverse current due to the photo-effect is significant and easily measurable. In contrast,the forward bias current is dominated by majority carriers,which are present in large numbers,making the fractional change due to the photo-effect negligible and difficult to measure.Therefore,both statements are true,and Statement $-2$ provides the correct explanation for why a photodiode is operated in reverse bias.

Statement $-1$: $A$ photodiode operates in reverse bias.
Statement $-2$: The fractional change due to the photo-effects on the minority carrier dominated reverse bias current is more easily measurable than the fractional change in the forward bias current.

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Statement $-1$: $A$ photodiode operates in reverse bias.Statement $-2$: The fractional change due to the photo-effects on the minority carrier dominated reverse bias current is more easily measurable than the fractional change in the forward bias current.