Hence the LED allows the flow of current in the forward direction and blocks the current in the reverse direction. It forces the majority charge carriers to move across the junction ... .decreasing the width of the depletion layer. PN Junction Diode Characteristics[ V-I Forward and Reverse] PN Junction diode is a semiconductor devices which conducts from only one side. V Definition. 1. Joining p-and n-doped semiconductors. Forward biasing a pn junction diode is very simple. PN junction can basically work in two modes, (Abattery is connected to the diode) forward bias mode (positive terminal connected to p-region and negative terminal connected to n region) reverse bias mode (negative terminal connected to p-region and positive terminal connected to n region) … Holes. As opposite charges attract, few holes in P-type tend to go to n-side, whereas few electrons in N-type tend to go to P-side. e Its width depends upon the doping level.. thin depletion layer e Heavy doped o lightly doped thick depletion layer, POTENTIAL BARRIER The electrons in the N region have to climb the potential hill in order to reach the P region Electrons trying to cross from the N region to P region experience a retarding field of the battery and therefore repelled. When Light Emitting Diode (LED) is forward biased, the free electrons from n-side and the holes from p-side are pushed towards the junction. If you continue browsing the site, you agree to the use of cookies on this website. Working of PN Junction Diode If an external potential is applied to the terminals of PN junction, it will alter the potential between the P and N-regions. However, unlike a resistor, a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current-voltage ( I-V ) relationship. Looks like you’ve clipped this slide to already. 40 30 20 10 40 Forward Bias Region 140 V (volts) 120 80 0.4 2 6 0.8 12 V (volts) Reverse Bias Region Figure 5.1: Diode Characteristics. Current-voltage characteristics of the p-n junction. Thus a pn junction is formed in diode. Normally the voltage is taken along the x-axis and current along y-axis. As the name stands PN junction Diode is made up of P type and N Type semiconductor material. In 1962, Nick Holonyak has come up with an idea of light emitting diode, and he was working for the general electric company. A p-n junction diode is formed by placing and n type semiconductor materials in intimate p contact on an atomic scale. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. The P … PN junction diode – Study Material. Here discussion is limited only to acquaintation with the basic techniques and terminology (not expertise in fabrication). RESISTORS If you have your own PowerPoint Presentations which you think can benefit others, please upload on LearnPick. In ideal conditions, this PN junction behaves as a short circuit when it is forward biased, and as an open circuit when it is in the reverse biased. o Electronic Symbol .....the triangle shows indicated the direction of current P type N type Depletion layer forms an insulator between the 2 sides. When free electrons reach the junction or depletion region, some of the free electrons recombine with the holes in the positive ions. See our User Agreement and Privacy Policy. This video explains complete process of diode working i.e. o The depletion layer contains no free and mobile charge carriers but only fixed and immobile ions. The circuit connection for determining the V-I characteristics of a pn junction is shown in the figure below. As the newly formed component can have two terminals or electrodes (one connected to P-type and the other to the N-type) it is called as diode or P-N junction diode or semi-conductor diode. This concentration will be more at the junction. P type and N type semiconductors, takenseparately are of very limited use.If we join a piece of P type material to a pieceof N type material such that the crystalstructure remains continuous at the boundary,,….. A PN JUNCTION is formed. You just need to take a battery whose values can be varied from (o to V volts), connect its positive terminal to the p-side of pn junction diode and then connect the negative terminal of battery to the n-side of the pn junction diode. The p-n junction is a versatile element, which can be used as a It operates like any other forward biased junction diode. ... PIN Diode Working Characteristics and Its Applications.pdf. Clear your doubts from our Qualified and Experienced Tutors and Trainers, Download Free and Get a Copy in your Email. If a P-type and an N-type material are brought close to each other, both of them join to form a junction, as shown in the figure below. Now customize the name of a clipboard to store your clips. A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. Consider the nside of the junction, where the excess minority carriers are holes. When a forward voltage is applied to the PN junction diode. Formation of depletion layer the excess electrons in the N region cross the junction and combine with the excess holes in the P region. PN junction can basically work in two modes, (A battery is connected to the diode ) Oforward bias mode ( positive terminal connected to p-region and negative terminal connected to n region) areverse bias mode ( negative terminal connected to p-region and positive terminal connected to n region) . Light Emitting Diode (LED) works only in forward bias condition. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. ... PN JUNCTION DIODES AND. This potential difference can alter the flow of majority carriers, so that the PN junction can be used as an opportunity for the diffusion of electrons and holes. PN Junction diode. o For each hole in the P section that combines with an electron from the N section, a covalent bond breaks and an electron is liberatyed which enters the positive terminal Thus creating an electron hole pair. Current in the N region is carried by ....electrons Current in the P region is carried by . The LED occupies the s… V-I characteristics of p-n junction diode. See our Privacy Policy and User Agreement for details. pn-junction-fabrication In practice, the P-N junction is formed from a single mono crystalline structure by adding carefully controlled amounts of donor and acceptor impurities. The overall unit is of very small dimension nearly about 2.5 mm. PN junction can basically work in two modes, (A battery is connected to the diode) Oforward bias mode (positive terminal connected to p-region and negative terminal connected to n region) areverse bias mode (negative terminal connected to p-region and positive terminal connected to n … The horizontal line in the below figure represents the amount of voltage applied across the p-n junction diode whereas the vertical line represents the amount of current flows in the p-n junction diode. The terminal connected to P-type material is called Anode and … how the electrons and holes are released while applying FB and RB in PN-junctions. . Let us consider few notations. 2. interface or a boundary between two semiconductor material types Movement of electrons and holes when forming the junction Depletion Region Approximation: Step Junction Solution Fig. An attractive animation is presented in this video with complete voice description. P-n junctions consist of two semiconductor regions of opposite type. Similarly for holes from P region. P-N JUNCTION  Also known as a diode  One of the basics of semiconductor technology -  Created by placing n-type and p-type material in close contact  Diffusion - mobile charges (holes) in p- type combine with mobile charges (electrons) in n-type 14. ADVANTAGES: o No filament is necessary Occupies lesser space o Long life. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. This may be achieved by diffusing acceptor impurities in to an n type silicon crystal or by the opposite sequence. Such junctions show a pronounced rectifying behavior. If you continue browsing the site, you agree to the use of cookies on this website. This is done to order to allow the light energy to pass through it. As only the junction is exposed to radiation, thus, the other portion of the glass material is painted black or is metallised. They become minority carriers of the other side. Now, in this junction, there exist… Pn junction diode characteristics Lab expriment, Presentation on half and full wave ractifier.ppt, No public clipboards found for this slide. Hence it is an unidirectional device. Once the junction is crossed, a number of electrons and the holes will recombine . You can change your ad preferences anytime. P-N Junction Diode: A P-N Junction Diode is one of the simplest semiconductor devices around, and which has the characteristic of passing current in only one direction only. A p-n junction is the metallurgical boundary between the n and p-regions of a semiconductor crystal. When the voltage is applied, due to the forward biased condition, the majority carriers of one side move towards the other. A PN junction is the simplest form of the semiconductor diode. Depletion and built-in voltage. The PN junction of the device placed inside a glass material. Towards the junction is the simplest form of the depletion layer.. Thickness of... To allow the light Emitting diode ( LED ) works only in forward bias condition net positive charge the! Score which will increase your profile visibility fabrication ) exponentially as seen away from the junction crossed... The s… a p-n junction is the simplest form of the order of 10-6meter and instant... 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