Assertion: A p-n junction with reverse bias c | vedclass

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

Question

(A) photo-diode is a reverse-biased $p-n$ junction diode. At the $p-n$ junction,there exists a junction electric field which,at equilibrium,does not p

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) photo-diode is a reverse-biased $p-n$ junction diode. At the $p-n$ junction,there exists a junction electric field which,at equilibrium,does not permit the flow of charge carriers across the junction.When such a $p-n$ diode is illuminated with light photons having energy $h
u > E_{g}$,electron-hole pairs are generated in the depletion layer (or near the junction). These charge carriers are separated by the junction field and made to flow across the junction,resulting in a change in the reverse saturation current.Because the reverse current is highly sensitive to the generation of these photo-excited carriers,the change in current is directly proportional to the incident light intensity. Thus,the device acts as a photo-detector.

Assertion: $A$ $p-n$ junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.

Similar Questions

$A$ red $LED$ emits light at $0.1 \ W$ uniformly in all directions. The amplitude of the electric field of the light at a distance of $1 \ m$ from the diode is.... $V \ m^{-1}$

Which one of the following symbols represents a photodiode?

When an $LED$ is manufactured by using aluminium gallium arsenide $(AlGaAs)$,it emits:

What type of $p-n$ junction diode does not require forward bias to operate?

An $LED$ is a $p-n$ junction diode which is

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion: $A$ $p-n$ junction with reverse bias can be used as a photo-diode to measure light intensity.Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.