Why are photodiodes used preferably in reverse bias condition?

Options

A. fractional change in majority carriers produce higher forward bias current
B. fractional change in majority carriers produce higher reverse bias current
C. fractional change in minority carriers produce higher forward bias current
D. fractional change in minority carriers produce higher reverse bias current

Answer

D

Explanation

In photo–diode, the diode is connected in reverse bias, so initially the current will be very small. If light is incident on thediode, its photons produce more minority charge carriers, which are called photo generated charge carriers, due to which the reverse current increases. In reverse bias, the current is already very small, So fractional charge in the current due to the light will be large.