Q 12-14-108JEE MainJEE Main 2022 (25 Jun, Shift 1)Easy
A photodiode is used to detect optical signals. These diodes are preferably operated in reverse biased mode because
Answer: (D) fractional change in minority carriers produces higher reverse bias current
Light creates equal numbers of extra electrons and holes. This changes the majority carrier density only slightly in fraction, but the minority carrier density changes by a large fraction. The reverse current is carried by minority carriers, so it changes appreciably with light intensity, which makes detection easy in reverse bias.
Solution by Sreeraj P, M.Sc Physics