The photodiode is used to detect optical sign | vedclass

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Question

(D) photodiode is a $p-n$ junction diode fabricated with a transparent window to allow light to fall on the diode. When the photodiode is illuminated

Vedclass · Accepted Answer

fractional change in minority carriers produces higher reverse bias current

Vedclass · Answer

(D) photodiode is a $p-n$ junction diode fabricated with a transparent window to allow light to fall on the diode. When the photodiode is illuminated with light (photons with energy $h
u > E_g$),electron-hole pairs are generated due to the absorption of photons. These charge carriers are minority carriers in the depletion region. Under reverse bias,the electric field sweeps these minority carriers across the junction,creating a current. Because the reverse saturation current is highly sensitive to the generation of minority carriers,a small fractional change in the incident light intensity produces a significant,easily detectable change in the reverse bias current.

The photodiode is used to detect optical signals. These diodes are preferably operated in reverse biased mode because:

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