What is depletion region in 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.
Where is the depletion region of a pn 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.
What is pn junction PPT?
A PN junction is a device formed by joining p-type ( doped with B, Al) with n-type (doped with P, As, Sb) semiconductors and separated by a thin junction is called PN Junction diode or junction diode.
How is depletion region formed in a PN junction?
The depletion region is caused by the diffusion of charges. Because of the concentration gradient holes diffuse from p-side to the n-side across the junction while electrons diffuse from the n-side to the p-side. The pair of positive and negative ions at the junction forms the dipole.
Why it is called depletion region?
The depletion region is so named because it is formed from a conducting region by removal of all free charge carriers, leaving none to carry a current.
What is the purpose of depletion region?
The depletion region acts like a wall between p-type and n-type semiconductor and prevents further flow of free electrons and holes.
What does the depletion region consists of?
Depletion layer consists of negative and positive charges (ions) on either side of the junction. Depletion layer consists of negative ions (acceptor ions) on the p-side and positive ions (donor ions) on the n-side. Depletion layer opposes majority carriers in crossing the junction.
What is diode PPT?
A diode (one way valve) is a PN junction with p-type on one side and n-type on the other. When a positive voltage is applied to the p-type side (forward bias), it shrinks and overcomes the depletion zone, causing the current to flow from the p-type to the n-type side.
What are the types of PN junction diode?
Different types of PN-junction diodes
- Light Emitting Diode (LED) Very much used in a dancing light display of music systems and information boards on railway stations.
- Photodiode. A PN junction diode made of photosensitive semiconductor is called a photodiode.
- Solar Cell.
- Zener Diode.
What is depletion region made of?
This region of uncovered positive and negative ions is called the depletion region due to the depletion of carriers in this region. The depletion region is so named because it is formed from a conducting region by removal of all free charge carriers, leaving none to carry a current.
What is depletion region explain?
[ dĭ-plē′shən ] A region in a semiconductor device, usually at the juncture of P-type and N-type materials, in which there is neither an excess of electrons nor of holes. Large depletion regions inhibit current flow. See also semiconductor diode.
How is depletion region?
A region in a semiconductor device, usually at the juncture of P-type and N-type materials, in which there is neither an excess of electrons nor of holes. Large depletion regions inhibit current flow. See also semiconductor diode.