Statement -I: 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 $-I$ is true,Statement $-II$ is true,Statement $-II$ is the correct explanation of Statement $-I$.

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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. When the photodiode is illuminated with light (photons with energy $hu > E_g$),additional electron-hole pairs are generated. 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 already present in large numbers. The fractional change due to the photo-effect in forward bias is very small and difficult to detect. Thus,both statements are true,and Statement $-II$ correctly explains why the photodiode is operated in reverse bias.

Statement $-I$: $A$ photodiode operates in reverse bias.
Statement $-II$: 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 $-I$: $A$ photodiode operates in reverse bias.Statement $-II$: 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.