What is depletion layer in transistor?
In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an …
Does transistor have depletion layer?
Originally Answered: What is the number of depletion layers in a transistor? For a BJT there is one for each pn-junction. Therefore, there are two depletion regions. The thickness of the depletion layer will depend on the biasing condition applied to the junction.
How many depletion layers are there in transistor?
two
It has three terminals namely emitter, base and collector. A bipolar junction transistor, shortly termed as BJT is a current controlled device that consists of two PN junction for its function. and there are two areas of depletion.
What is depletion layer and how it is formed?
The depletion region is caused by the diffusion of charges. The holes and the electrons diffusing towards each other combine near the junction. In doing so positive and negative ions are formed. The pair of positive and negative ions at the junction forms the dipole.
How many depletion layer is formed in PNP transistor?
two depletion layers
When transistor is made, the diffusion of free electrons across the junction produces two depletion layers.
What happens to depletion layer in breakdown?
The process by which a depletion region at the p-n junction is destroyed and allows a large reverse current is called depletion region breakdown. This minority carrier current in the reverse biased p-n junction diode is called reverse current or reverse saturation current.
What does depletion layer contain?
Note: The depletion layer consists of both electrons and protons but they are immobile in nature therefore the correct answer would be immobile ions. The donor and acceptor atom get a positive and negative charge due to which the PN junction forms.
What is depletion layer and barrier potential?
Depletion layer is a region created around the p-n junction which is devoid of free charge carriers and has immobile ions. Potential barrier is a potential difference or junction voltage developed across the junction due to migration of majority carriers across it when p-n junction is formed.
Which layer is the most thin depletion layer in transistor?
It is the collector that has the lightest doping. You are mistaken. It is so because the doping level is emitter > base > collector. In the active mode of transistor, the depletion layer is weakened slightly by the additional holes in the middle layer.
Where is depletion layer formed?
Formation of Depletion Layer In PN Junction This recombination of electrons and holes produces a narrow region at junction called depletion layer.
How many junctions does a PNP transistor have?
The pnp transistor has two p-n junctions. One junction is formed between the emitter and the base. This junction is called emitter-base junction or emitter junction. The other junction is formed between the base and the collector.