The depletion region is formed between the p-type and n-type material due to which the electric field is developed. The direction of the electric field is from the positive charges to the negative charges.
What is electric field in PN junction?
At the p-n junction, the “built-in” electric field and the applied electric field are in the same direction. When these two fields add, the resultant larger electric field is in the same direction as the “built in” electric field and this creates a thicker, more resistive depletion region.
Which side is positive in PN junction?
The “p” (positive) side contains an excess of holes, while the “n” (negative) side contains an excess of electrons in the outer shells of the electrically neutral atoms there. This allows electrical current to pass through the junction only in one direction.
What is the direction of current in PN junction diode in forward bias?
Hence, holes are considered as the charge carriers in the p-type semiconductor, which carry electric current from one point to another point. The actual direction of current is the direction of free electrons (from n-side to p-side).
What is electric field intensity?
A measure of the force exerted by one charged body on another. Imaginary lines of force or electric field lines originate (by convention) on positive charges and terminate on negative charges.
Why the direction of electric field is from P side to N side?
Due to the formation of static charges on either side of the boundary, an electric field develops in the direction from the N side to the P side. Now due to this electric field, the movement of majority carriers is stopped and hence the depletion region is formed .
What is pn junction with diagram?
Definition: A p-n junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor. The p-side or the positive side of the semiconductor has an excess of holes and the n-side or the negative side has an excess of electrons.
What is N and P semiconductor?
p-type and n-type materials are simply semiconductors, such as silicon (Si) or germanium (Ge), with atomic impurities; the type of impurity present determines the type of the semiconductor.
Why does current flow in reverse bias?
Reverse bias usually refers to how a diode is used in a circuit. If a diode is reverse biased, the voltage at the cathode is higher than that at the anode. Therefore, no current will flow until the electric field is so high that the diode breaks down.
What is the direction of drift current in pn junction?
Similarly holes are drifted towards the p-type. Thus due to these holes and electron drift, a drifting current exists which flows from n-type to p-type.
Is zener diode forward biased?
The Zener diode operates just like the normal diode when in the forward-bias mode, and has a turn-on voltage of between 0.3 and 0.7 V. … As the reverse voltage increases to the predetermined breakdown voltage (Vz), a current starts flowing through the diode.
How current is produced in forward bias?
The net effect of forward bias, then, is a current to the right that increases as voltage increases. Unlike reverse bias, the current that flows under forward bias is due to the movement of majority carriers, rather than minority carriers.
Can electric field intensity be negative?
An electric field can never be negative. An electric field is a force experienced by the charge divided by the magnitude of the charge.
How do you solve electric field intensity?
The electric field intensity at a point is the force experienced by a unit positive charge placed at that point.
- Electric Field Intensity is a vector quantity.
- It is denoted by ‘E’.
- Formula: Electric Field = F/q.
- Unit of E is NC–1 or Vm–1.
What is an electric field simple definition?
Electric field, an electric property associated with each point in space when charge is present in any form. … The electric field may be thought of as the force per unit positive charge that would be exerted before the field is disturbed by the presence of the test charge.