What is pn junction diode explain?

What is pn junction diode explain?

A p-n junction diode is a basic semiconductor device that controls the flow of electric current in a circuit. It has a positive (p) side and a negative (n) side. To make a p-n junction diode, a different impurity is added to each side of a silicon semiconductor to change how many extra holes or electrons are present.

What is the use of PN junction diode?

Applications of PN Junction Diode p-n junction diode can be used as a photodiode as the diode is sensitive to the light when the configuration of the diode is reverse-biased. It can be used as a solar cell. When the diode is forward-biased, it can be used in LED lighting applications.

What is pn junction diode and how it is formed?

P-n junctions are formed by joining n-type and p-type semiconductor materials, as shown below. Since the n-type region has a high electron concentration and the p-type a high hole concentration, electrons diffuse from the n-type side to the p-type side. A “built-in” potential Vbi is formed at the junction due to E.

How does pn junctions work?

PN junctions are fabricated from a monocrystalline piece of semiconductor with both a P-type and N-type region in proximity at a junction. The transfer of electrons from the N side of the junction to holes annihilated on the P side of the junction produces a barrier voltage.

Why PN junction is called a diode?

A diode is called a diode because it has two distinct electrodes (i.e. terminals), called the anode and the cathode. A diode is electrically asymmetric because current can flow freely from the anode to the cathode, but not in the other direction.

What is the main function of a PN junction?

A p-n junction represents an electrical component with the function to allow an electric current in one direction (called the forward biased condition) and to block the current in the opposite direction (the reverse biased condition): a diode.

What are two applications of pn diodes?

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.
• Diodes are used in voltage multipliers.
• Diodes are used as switch in digital logic circuits used in computers.

How do holes move in PN junction?

Formation of a P-n junction Since the n-type region has a high electron concentration and the p-type a high hole concentration, electrons diffuse from the n-type side to the p-type side. Similarly, holes flow by diffusion from the p-type side to the n-type side.

Why pn junction is called a diode?

What is the main function of a pn junction?

Which is symbol of PN junction diode?

Diode circuit symbol and polarity Like any diode, the PN junction diode has two connections or electrodes. This gives it its name: “di-” meaning two and “-ode” as a shortening of electrode. One electrode of the semiconductor device is termed the anode and the other is termed the cathode.

Why PN junction is called diode?

Why is a PN junction called a diode?

carriers. Since the p-n junction demonstrates such a unipolar (rectifying) response to the applied voltage it is called a p-n diode and is denoted in circuit diagrams as a following symbol: The current voltage (IV) characteristic for the diode is rectifying and is very different from that for a resistor. Ideal Diode I-V Characteristics

What are the advantages of a PN junction diode?

Advantages of p-n junction diode P-n junction diode is the simplest form of all the semiconductor devices. However, diodes plays a major role in many electronic devices. A p-n junction diode can be used to convert the alternating current (AC) to the direct current (DC). These diodes are used in power supply devices.

How does a PN junction formed in a diode?

How a PN Junction Formed in a Diode When you take a block of silicon and dope part of it with a trivalent impurity and the other part with a pentavalent impurity, a boundary called the pn junction is formed between the resulting p-type and n-type portions .

A PN-junction diode is formed when a p-type semiconductor is fused to an n-type semiconductor creating a potential barrier voltage across the diode junction The effect described in the previous tutorial is achieved without any external voltage being applied to the actual PN junction resulting in the junction being in a state of equilibrium.