What are the applications of pn junction diode and explain how the PN junction diode acts as a switch?
One of such applications is an electrical switch. The PN junction, when forward biased acts as close circuited and when reverse biased acts as open circuited. Hence the change of forward and reverse biased states makes the diode work as a switch, the forward being ON and the reverse being OFF state.
Which is an example of pn junction diode?
For example, a common type of transistor, the bipolar junction transistor, consists of two p–n junctions in series, in the form n–p–n or p–n–p; while a diode can be made from a single p-n junction. A Schottky junction is a special case of a p–n junction, where metal serves the role of the n-type semiconductor.
Why pn junction is called diode?
Why is p-n-junction is also called a junction diode? Solution : A p-n-junction allows a large current to flow through it when forward biased and it offers a high resistance when reverse biased. The unidirectional property is similar to that of vacuum diode. Hence, p-n-junction is also called a junction diode.
What is PN application?
Applications of P-N Junction Diode It can be used as a solar cell. When the diode is forward-biased, it can be used in LED lighting applications. It is used as rectifier in many electric circuits and as a voltage-controlled oscillator in varactors.
Is PN junction used as detector?
In order to use the P-N junction semiconductor as a detector for high-energy charged particles and for x- and gamma rays, one has to increase the energy deposited within the charge-sensitive region.
How the pn junction is applied in electronic devices?
The process of applying the external voltage to a p-n junction semiconductor diode is called biasing. External voltage to the p-n junction diode is applied in any of the two methods: forward biasing or reverse biasing. If the p-n junction diode is forward biased, it allows the electric current flow.
Why do we use a diode?
The most common function of a diode is to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking it in the opposite direction (the reverse direction). As such, the diode can be viewed as an electronic version of a check valve.
Can we use pn junction as amplifier?
The correct option is (d) rectifier.
When a pn junction is reverse biased?
When a p-n junction is reversed biased, the negative terminal of the battery attracts the free holes in the p-type towards itself whereas the positive terminal attracts the free electrons in n-type towards itself.
What is a p-n diode?
This P-N diode applications are very useful for beginners. As shown in the figure, PN junction diode is a 2 terminal polarity sensitive device. The diode conducts when forward bias is applied and it will introduce zero resistance in the circuit.
What structures are used for p–n semiconductor diodes?
The figure shows two of the many possible structures used for p–n semiconductor diodes, both adapted to increase the voltage the devices can withstand in reverse bias. The top structure uses a mesa to avoid a sharp curvature of the p+- region next to the adjoining n- layer.
Why do we use pn junction diode as rectifier?
A p-n junction diode allows electric current when it is forward biased and blocks electric current when it is reverse biased. This action of p-n junction diode enables us to use it as a rectifier. Diodes are used in clamping circuits for DC restoration. Diodes are used in clipping circuits for wave shaping.
What are the vi characteristics of the PN junction diode?
The VI characteristics of the PN junction diode are denoted by a curve that shows the relationship between the voltage and current in a circuit. Figure 6 shows the VI characteristics of the PN junction diode. From this curve, it can be seen that there are three operating regions in a diode.