Contents
What is the potential difference across the depletion region?
The p side is at an arbitrary potential, and the n side is at a potential higher than this because there is an electric field between them. This means there is a potential difference across the depletion region; this is known as the built-in potential.
Why the depletion region width is larger on the lightly doped side in a P-N junction?
Hence, the positive ions at n-side and the negative ions at p-side are increased over a given period. This increases the width of depletion region. Thus, the width of depletion region increases in the lightly doped semiconductors over a given period.
Does the depletion region in a P-N junction get wider or narrower when it is reverse biased?
The junction field-effect for an n-channel device utilizes two p+ − n junctions in opposition. In an asymmetrically doped p+ − n junction the depletion region is mainly formed within the lighter doped n-side of the junction. Application of a reverse bias increases the depletion region width.
Where is the depletion region of a P-N junction?
This space-charge region on either side of the junction together is known as the depletion region as the electrons and holes taking part in the initial movement across the junction depleted the region of its free charges.
How do I get rid of depletion region?
Forward bias (applying a positive voltage to the P-side with respect to the N-side) narrows the depletion region and lowers the barrier to carrier injection (shown in the figure to the right).
What is the reverse breakdown region?
The portion of the voltage-current characteristic beyond the initiation of breakdown for an increasing magnitude of reverse current.
What happens in the depletion region of a p n junction?
Depletion Region When a p-n junctionis formed, some of the free electrons in the n-region diffuse across the junction and combine with holesto form negative ions. In so doing they leave behind positive ions at the donor impuritysites.
How are negative ions formed in the depletion region?
Depletion Region When a p-n junction is formed, some of the free electrons in the n-region diffuse across the junction and combine with holes to form negative ions. In so doing they leave behind positive ions at the donor impurity sites.
What happens when the p-n junction is reverse biased?
When the p–n junction is reverse-biased, however, the junction barrier (and therefore resistance) becomes greater and charge flow is minimal. In a p–n junction, without an external applied voltage, an equilibrium condition is reached in which a potential difference forms across the junction. This potential difference is called built-in potential .
How to calculate the built in potential of a p-n junction?
The built-in potential 1 Calculate the thermal equilibrium density of electrons and holes in the p -type region as well as both densities in the… 2 Calculate the built-in potential of the p-n junction 3 Calculate the built-in potential of the p-n junction at 400 K. More