# How does the electric field vary within the depletion region in pn junction diode?

Contents

## What is the order of electric field in the depletion region of a junction diode?

Hence the order of the field in the depletion region is 106Vm-1.

## What is a depletion region for a pn junction diode?

Depletion region or depletion layer is a region in a P-N junction diode where no mobile charge carriers are present. Depletion layer acts like a barrier that opposes the flow of electrons from n-side and holes from p-side.

## Is there an electric field in the depletion region?

Depletion approximation: the electric field is confined to the junction region and there is no electric field in the quasi-neutral regions. No free carriers (n(x), p(x) = 0 ) in depletion region. 1 q d J n d x = ( U − G ) = 0 .

## Why an electric field is produced in a depletion region of a pn junction?

Light travels in packets of energy called photons. The generation of electric current happens inside the depletion zone of the PN junction. … The hole created by the dislodged electron is attracted to the negative charge of N-type material and migrates to the back electrical contact.

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## Why is there an electric field in the depletion region?

Due to the majority charge carrier diffusion described above, the depletion region is charged; the N-side of it is positively charged and the P-side of it is negatively charged. This creates an electric field that provides a force opposing the charge diffusion.

## Why is there no electric field outside the depletion region?

It has one electron and one proton less, so the overall charge is zero . if for each atom the overall charge is zero, then they dont generate any fied. And that’s exactly what you have outside the depletion region.

## What is depletion region in a PN junction which process causes depletion region in a PN junction?

The depletion layer in the p-n junction region is caused by diffusion of charge carriers.

## What is the importance of the depletion region in a PN junction diode?

This will result in the decreased efficiency of the p-n junction. Hence, the formation of a depletion layer across the junction is important to limit the number of majority carriers crossing the junction.

## What is electronic depletion?

The word depletion in English refers to the decrease in the quantity of something. Similarly, in semiconductors, the depletion region is the layer where the flow of charges decreases. This region acts as the barrier that opposes the flow of electrons from the n-side to the p-side of the semiconductor diode.

## How electric field is produced in pn junction?

Movement of electrons to the p-type side exposes positive ion cores in the n-type side while movement of holes to the n-type side exposes negative ion cores in the p-type side, resulting in an electron field at the junction and forming the depletion region.

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## Why electric field is maximum at junction?

The Electric Field gets stronger as you move past more space charge progressing towards the junction, reaching a maximum at that point because of accumulating the same sign charge. … So, peaking of the electric field is because of the overall neutrality of the positive and negative charges in each side of the junction.

## Why does the width of depletion region increase in reverse bias?

A P-N junction diode is formed by joining one P-type and one N-type diode. … This happens because when we apply reverse bias voltage the electrons are drifted away from the junction and hence, conduction is not possible. So, the width of the depletion region in a P-N junction diode is increased by reverse bias.

## In what way the width of depletion region can be varied?

In forward bias, the p-type is connected with the positive terminal and the n-type is connected with the negative terminal. With a battery connected this way, the holes in the P-type region and the electrons in the N-type region are pushed towards the junction. This reduces the width of the depletion zone.