Statement -1: A photodiode operates in revers | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

Vedclass · Accepted Answer

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

Vedclass · Answer

(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 $h
u > E_g$),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.

Similar Questions

$Assertion:$ The total translational kinetic energy of all the molecules of a given mass of an ideal gas is $1.5$ times the product of its pressure and its volume.
$Reason:$ The molecules of a gas collide with each other and the velocities of the molecules change due to the collision.

In a $P-N$ junction diode,if the $P$ region is more heavily doped than the $N$ region,then the depletion layer is:

Gluconeogenesis is the process of....

For $x > 1$,if $(2x)^{2y} = 4e^{2x - 2y}$,then $(1 + \log_e 2x)^2 \frac{dy}{dx}$ is equal to

The image of the point $(3, 2, 1)$ in the plane $2x - y + 3z = 7$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module

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.