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what is pn junction diode

PN junction diode – Study Material. It has two terminal anode and cathode. It forms a P-N Junction. VI Characteristic of PN Junction Diode. Most semiconductor devices contains one or more pn junctions. The process of applying an exte “biasing” . The basic symbol of p-n junction diode under forward bias and reverse bias is shown in the below figure . P-N junction Diode is a semiconductor device which has two terminal or two electrodes and allow electric current to flow only in one direction. If one side of a single crystal of pure semiconductor (Ge or Si) is doped with acceptor impurity atoms and the other side is doped with donor impurity atoms, a PN junction is formed as shown in Fig P region has a high concentration of holes and N region contains a large number of electrons. The PN junction diode cannot emit light. The direction of the current depends upon the biasing of the diode. It is a relationship between the current through the diode and applied voltage. PN junction diode is symbolically represented as shown in picture. PN Junction Diode Multiple Choice Questions and Answers for competitive exams. On the other hand, the Zener diode allows both the forward and reverse current to pass through it. Diode Consisting p and n both junctions in its structure is called p-n junction diode. The PN junction diode is used for rectification purpose because it allows the current to flow only in one direction. A Semiconductor diode facilitates the flow of electrons completely in one direction only – which is the main function of semiconductor diode. Today, we’ll talk about P-N junction diode. Depletion region created across the pn junction by the initial movement of majority carrier across the junction. (ii) Give the symbol for a semiconductor diode. The pn junction is of great importance as it is the main control element for the semiconductor devices. A diode has two terminals; one terminal is taken from the P-type layer and it is known as Anode. I am going to cover all the diodes in my some of the next blogs. The boron atom adds a hole when it bonds with the silicon atoms. A p–n junction diode is made of a crystal of semiconductor, usually silicon, but germanium and gallium arsenide are also used. The most common method of making p n junction is called Alloying. It allows electric current to pass only in one direction while blocks in the other direction. A PN junction with two metallic contacts is known as a pn junction diode or a semiconductor diode. In LED all energy converted into a light: In PN junction diode all energy converted into a heat. For a PN junction diode, the current in reverse bias maybe (A) Few milliamperes (B) Between 0.2 A and 15 A (C) Few amperes (D) Few micro or nano amperes. The junction region or the transition region where the nature of the semiconductor material changes from p-type to n-type is usually very thin, typically 10 -6 to 10 -4 cm wide depending on the method of concentration. It has low forward voltage drop. p-n junction is a single piece of a semiconductor material (either Si or Ge) with one portion doped with pentavalent impurity and the other portion doped with The Reverse recovery time and reverse recovery loss are more. A P-N junction diode is a piece of silicon that has two terminals. One terminal of p-n junction diode is Anode and other is cathode. The direction of arrow is the direction of conventional current flow (under forward bias). The right side of this graph is forward voltage region and a diode is in forward biased. The pn junction is the basis for diodes, certain transistors, solar cells, and other devices. It is a non-linear, active element.For a definite polarity, it conducts well but becomes non conducting with opposite polarities. I am looking forward to your readership. A p-type material consists of silicon atoms and trivalent impurity atoms such as boron. Reverse recovery time and reverse recovery loss are very very less. A diode is a controlling element for electronic devices and circuits. The PN junction diode consist of a PN junction formed either germanium or silicon crystal. The P-N junction is the basic element for semiconductor diodes. A p–n diode is a type of semiconductor diode based upon the p–n junction. 1) Forward bias. Answer: (D) Few micro or nano amperes. The PN junction diode silicon or germanium material. A PN junction diode is a two-terminal electronic component that allows the flow of electric current only in one direction. Semiconductor PN Junction Diode is the simplest semiconductor device. Compare to schottky diode it has more forward voltage drop. A PN junction is the basic or simplest form of the semiconductor diode. It allows the flow of electric current only in forward biased condition, in the reverse-biased it blocks the flow of electric current. Thus, it is referred as a metallurgical junction. The P-N junction diode appeared in the year 1950. For All Subject Study Materials – Click Here. The PN junction diode is a two-terminal device, which is formed when one side of the PN junction diode is made with p-type and doped with the N-type material. P-n junction diode consists of two semiconductor layers (p type – anode and n type – cathode). This junction is known as PN junction. A p-n junction diode is a basic semiconductor device that controls the flow of electric current in a circuit. What is a PN junction diode [Image Credit] A PN Junction diode is a 2 terminal device fabricated by joining P-type and N-type semiconductors chemically (image given above) and . A PN junction or P-N diode consists of a semiconductor having two regions, a p-region and n-region with a junction in between. A P-N junction is formed by two layers of doped Gallium Arsenide where a High reflective coating is applied to one end of the junction and a partial reflective coating at the other end. A p-n junction diode allows electric current when it is forward biased and blocks electric current when it is reverse biased. The interface which joins both is made up of metal. Impurities are added to it to create a region on one side that contains negative charge carriers (electrons), called an n-type semiconductor, and a region on the other side that contains positive charge carriers , called a p-type semiconductor. Formation of pn Junction In actual practice, a pn junction will not be formed … What Is a PN Junction When a p-type semiconductor is suitably joined to an n-type semiconductor, the contact surface is called pn junction. The PN junction has the very useful property that electrons are only able to flow in one direction. Junction is formed between P and N type semiconductors. The LED uses GaAs, GaAsP or GaP material. Actually, p n junction is fabricated by special technique, namely growing, alloying and diffusing methods. The 'P' side of a pn junction diode is always positive terminal and is called as anode. The X-axis represents a voltage and Y-axis represents the current through the diode. ideally, this PN junction behaves as a short circuit (zero resistance ) when it is forward biassed, and as an open circuit (infinity resistance) when it is in the reverse biased. There are two ways in which we can bias a pn junction diode. It is the most essential and the basic building block of the electronic device. The PN junction diode is the basic semiconductor diode format. It is a type of switch which only allows the forward current to pass through it. These short solved questions or quizzes are provided by Gkseries. A diode’s standard working depends on the interaction of n-type semiconductor and p-type semiconductors.. N-type Semiconductor In this type of diode, we dope one side of a semiconductor piece with an acceptor impurity and another side with a donor impurity.A PN junction diode is a two-terminal electronics element, which can be classified as either ‘step graded’ or ‘linear graded’. On n-side there are large number of electrons … If diode is in forward biased then it allow current to flow and act as an closed circuit ,but if the diode is in reverse biased then it block current flow and act as an open circuit. This device is a combination of P-type and N-type semiconductor material hence it is also known as PN Junction Diode. A junction is formed between the P-type and N-type layers. The p-n junction diodes made from silicon semiconductors works at higher temperature when compared with the p-n junction diodes made from germanium semiconductors. when we combine the P-type material with N-type material P-N junction is formed. This property is quite similar to the property of vacuum diodes. When PN junction is in forward bias, by increasing the battery voltage (A) Circuit resistance increases (B) Current through P_N junction increases (C) Current through P_N junction decreases … Now lets try applying an external voltage to the pn junction diode.rnal voltage is called as . Formation of p-n Junction. In actual practice, the PN junction is not formed just by bringing a p-type semiconductor block near to an n-type semiconductor block. PN junction Diode plays a vital role in our electronic fields, because of their unique property (current flows in only one direction) they are used in many electronic or electrical circuits like rectifiers, switches, clippers, clampers, voltage multipliers. In case of Zener diodes, the concentrations of the impurities in the semiconductors must be precisely determined (typically significantly higher than in p-n diodes) in order to obtain the desired breakdown voltage. They are used in High … The diode conducts current in only one direction, and it is made by joining a p-type semiconducting layer to an n-type semiconducting layer. How P-N junction is formed. It is used for many forms of rectification for current levels both large and small, as well as high and low voltage levels, and this semiconductor device finds many uses in all manner of electronic circuit designs. It is represented as a graph. One of the terminals is doped with P-type material and the other with N-type material. Note:- I have written an interesting article which tells the story behind invention & discovery of PN Junction diode. The PN-junction is the root for semiconductor diodes. A PN-junction is said to be condition when an N-type material is combined together with a P-type material creating a semiconductor diode. A diode is a two-terminal device formed by placing a layer of P-type semiconductor next to N -type semiconductor. Due to this characteristic, the diode finds number of applications as given below: Rectification; The conversion of alternating current into direct current is known as rectification. The p-n junction diodes are one of the most used elements in electronic circuits. PN junction diode is one of the fundamental elements in electronics. Depletion layer opposes only the the majority carrier not minority carrier. Working of PN Diode Junction:. Answer. P-N Junction Diode: Junction is formed between N type semiconductor to Metal plate. These short objective type questions with answers are very important for Board exams as well as competitive exams. The positive side of a diode is known as the anode and the negative side is known as the cathode.. Current can spill out of the anode end to the cathode, but it cannot pass from cathode to the anode. 5. PN Junction diode. By joining of P type semiconductor and N type semiconductor the PN junction diode is formed using a special technique. 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