How do you explain a pn junction?
What is P-N Junction? 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. In a semiconductor, the P-N junction is created by the method of doping.
What are the popular methods of forming pn junction?
The p-n junction can be formed by different methods. They are (i) Grown junction method, (ii) Alloying method and (iii) Diffusion method.
What is pn junction diode explain with diagram?
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 created by adding impurities to each side of a silicon semiconductor. The symbol for a p-n junction diode is a triangle pointing to a line.
What is pn junction example?
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 a 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 are the three methods of diode fabrication?
Semiconductor diode fabrication types
- alloy-type or fused junction diode.
- diffused-junction-diode.
- epitaxially-grown-diode.
- point-contact-diode.
Which of following is a method of fabrication of pn junction?
Diffusion Diode: Diffusion is a process by which a heavy concentration of particles diffuse into a surrounding region of lower concentration.
What is application of PN junction diode?
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 pn junction 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.
How pn junction is prepared?
What is depletion region?
The word depletion in English refers to the decrease in the quantity of something. Similarly, in semiconductors, the depletion region is the layer where the flow of charges decreases. This region acts as the barrier that opposes the flow of electrons from the n-side to the p-side of the semiconductor diode.
Which method is used for fabrication of PN junction?
Diffusion Diode: Diffusion is a process by which a heavy concentration of particles diffuse into a surrounding region of lower concentration. The main difference between the diffusion and alloy process is the fact that liquefaction is not reached in the diffusion process.
What is a fabrication method?
Cutting, punching, forming, shearing, stamping, welding are common fabrication techniques used to shape, cut, or mold raw metal material into a final product. Fabrication is distinct from other manufacturing processes.
What are the characteristics of pn junction?
V-I Characteristics of PN Junction Diode
- Zero bias.
- Forward bias.
- Reverse bias.
What is the unit of diode?
A diode is not a measurable quantity. Hence,it does not have a unit. Generally,for a diode,we measure characteristics like forward voltage drop,reverse voltage drop and reverse breakdown voltage which are usually measured in Volts.
How is the p-n junction created in a semiconductor?
In a semiconductor, the p-n junction is created by the method of doping. The process of doping is explained in further detail in the next section.
What is the formula for pn junction?
P-N Junction Formula The formula used in the p-n junction depends upon the built-in potential difference created by the electric field is given as: \\(E_{0}=V_{T}ln[\\frac{N_{D}.N_{A}}{n_{i}^{2}}]\\)
What are the biasing conditions for a p-n junction diode?
There are three biasing conditions for p-n junction diode and this is based on the voltage applied: Zero bias: There is no external voltage applied to the p-n junction diode. Forward bias: The positive terminal of the voltage potential is connected to the p-type while the negative terminal is connected to the n-type.