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) . PN Junction Diode Characteristics[ V-I Forward and Reverse] PN Junction diode is a semiconductor devices which conducts from only one side. Minority charge carrier concentration reduces exponentially as seen away from the junction. 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 … Similarly, o An additional holes from the P region are repelled by the net positive charge of the n region. PN junction diode – Study Material. In LED, the p and n regions are forward biased. A PN junction is the simplest form of the semiconductor diode. how the electrons and holes are released while applying FB and RB in PN-junctions. 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. The LED occupies the s… See our User Agreement and Privacy Policy. It is created by doping. Looks like you’ve clipped this slide to already. Today: 1. o As an switch in computer circuits. If you continue browsing the site, you agree to the use of cookies on this website. Questions you should be able to answer by the end of today’s lecture: The LED is a special type of diode and they have similar electrical characteristics of a PN junction diode. ... PIN Diode Working Characteristics and Its Applications.pdf. 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. 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. This is known as DEPLETION LAYER ..Thickness is of the order of 10-6meter. Consider the nside of the junction, where the excess minority carriers are holes. Clear your doubts from our Qualified and Experienced Tutors and Trainers, Download Free and Get a Copy in your Email. V Definition. Such junctions show a pronounced rectifying behavior. Holes. For All Subject Study Materials – Click Here. The circuit connection for determining the V-I characteristics of a pn junction is shown in the figure below. Forward biased diode: In a very PN junction diode once the forward voltage is applied that is, a positive terminal of a source is connected to the p aspect, and conjointly the negative terminal of the availability is connected to the n-type aspect, the diode is speculated to be in forward biased condition. Let us consider few notations. When a forward voltage is applied to the PN junction diode. A P-type material has holes as the majority carriers and an N-type material has electrons as the majority carriers. PN junction diodes can be obtained in a number of semiconductor materials - the earliest diodes tended to be made from germanium, but most of them today are silicon diodes. When the voltage is applied, due to the forward biased condition, the majority carriers of one side move towards the other. An additional electrons from the N region are repelled by the net negative charge of the p region. ... PN JUNCTION DIODES AND. The P … P-NJUNCTION p-njunction is a boundary or interface between two types of semiconductor material/ p- type and n-type, inside a single crystal of semiconductor. 4 Basic Semiconductor. The p-n junction is a versatile element, which can be used as a They become minority carriers of the other side. A p-n junction is the metallurgical boundary between the n and p-regions of a semiconductor crystal. 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. interface or a boundary between two semiconductor material types The m… 3. For example, if N-type is considered, the excess of holes that enter into N-type after applying forward bias, adds to the already present minority carriers of N-type material. They are also called p-n diodes in analogy with vacuum diodes. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. PN Junction Diode ENGI 242 ELEC 222 PN Junction Diode Diode Model Analysis Ideal Approximation Exact Diode Specification Sheets Diode Resistance Static Resistance RD ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 6e985b-NzNlY Normally the voltage is taken along the x-axis and current along y-axis. o The depletion layer contains no free and mobile charge carriers but only fixed and immobile ions. Formation of depletion layer the excess electrons in the N region cross the junction and combine with the excess holes in the P region. Current-voltage characteristics of the p-n junction. N region loses its electrons ......becomes + VIY charged P region accepts the electrons ......becomes -vly charged At one point , the migratory action is stopped. You can change your ad preferences anytime. 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. o Potential thus produced are called ..potential barrier Ge..O.3V Si ..o.7V. If you continue browsing the site, you agree to the use of cookies on this website. This video explains complete process of diode working i.e. Thus a reverse biased pn junction does not conduct current. This may be achieved by diffusing acceptor impurities in to an n type silicon crystal or by the opposite sequence. Now, in this junction, there exist… 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. RESISTORS o Thus the P N junction diode allows the electrons flow only when P is positive , o This property is used for the conversion of AC into DC , Which is called rectification. PN Junction diode. 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. A p-n junction diode is formed by placing and n type semiconductor materials in intimate p contact on an atomic scale. 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. A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. Depletion and built-in voltage. See our Privacy Policy and User Agreement for details. APPLICATIONS- as rectifiers to convert AC into DC. P-n junctions consist of two semiconductor regions of opposite type. Similarly for holes from P region. ADVANTAGES: o No filament is necessary Occupies lesser space o Long life. As the name stands PN junction Diode is made up of P type and N Type semiconductor material. V Principle of Solar Cell V Current generation V I-V characteristic of an illuminated p-n junction V Physical process of Solar cell V I-V characteristic of solar cell V Solar cell parameter V Applications V reference V Device that converts optical energy into electrical energy. 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. Joining p-and n-doped semiconductors. 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. 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. Pn junction diode characteristics Lab expriment, Presentation on half and full wave ractifier.ppt, No public clipboards found for this slide. As both of them travel towards the junction, holes and electrons recombine with each other to neutralize and forms ions. 1. The PN junction of the device placed inside a glass material. Light Emitting Diode (LED) works only in forward bias condition. The V-I characteristics or voltage-current characteristics of the p-n junction diode is shown in the below figure. Hence it is an unidirectional device. These materials are N-type, having electrons are majority carrier and P-type material, having holes are majority carrier. Volt-ampere (V-I) characteristics of a pn junction or semiconductor diode is the curve between voltage across the junction and the current through the circuit. Here discussion is limited only to acquaintation with the basic techniques and terminology (not expertise in fabrication). This is done to order to allow the light energy to pass through it. Lecture 18 The P-N Junction (The Diode). With proper biasing, PN diode allows current to flow in SINGLE DIRECTION. Reverse biased junction If the + of the battery is connected to the n-type and the - terminal to the p-type, the free electrons and free holes are attracted back towards the battery, hence back from the depletion layer, hence the depletion layer grows. PN Junction diode is a device made of two semiconductor material joined together with the required amount of impurity. 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. When free electrons reach the junction or depletion region, some of the free electrons recombine with the holes in the positive ions. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 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. Once the junction is crossed, a number of electrons and the holes will recombine . It operates like any other forward biased junction diode. 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. The name diode is derived from “di–ode” which means a device that has two electrodes. Working of Light Emitting Diode. The Light emitting diode is a two-lead semiconductor light source. o Electronic Symbol .....the triangle shows indicated the direction of current P type N type Depletion layer forms an insulator between the 2 sides. But the material from which it is composed differentiates it from the ordinary one. Current in the N region is carried by ....electrons Current in the P region is carried by . Understanding about the P-N Junction Diode Theory and Working A P-N Junction Diode is formed by doping one side of a piece of silicon with a P-type dopant (Boran) and the other side with a N-type dopant (phosphorus).Ge can be used instead of Silicon. 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. 2. In 1962, Nick Holonyak has come up with an idea of light emitting diode, and he was working for the general electric company. For each approved PPT you will get 25 Credit Points and 25 Activity Score which will increase your profile visibility. 1. As only the junction is exposed to radiation, thus, the other portion of the glass material is painted black or is metallised. 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. PN.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. o As detectors in radios to detect audio signals o As LED to emit different colours. 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. When the length of the nregion is longer than the di usion length, the hole concentration at a distance xfrom the depletion region, marked in gure 3, is given by p n(x) = p n(0) exp(x L h) excess holes ) p … Doping with acceptor creates p type semiconductor while doping with donors produces n type. 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. An attractive animation is presented in this video with complete voice description. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Movement of electrons and holes when forming the junction Depletion Region Approximation: Step Junction Solution Fig. Please enter the OTP sent to your mobile number: Post an enquiry and get instant responses from qualified and experienced tutors. 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) … Clipping is a handy way to collect important slides you want to go back to later. It forces the majority charge carriers to move across the junction ... .decreasing the width of the depletion layer. . It is used majorly in rectifier and voltage regulator circuits. Forward biased PN junction o. Forward biasing a pn junction diode is very simple. Hence the LED allows the flow of current in the forward direction and blocks the current in the reverse direction. The terminal connected to P-type material is called Anode and … V-I characteristics of p-n junction diode. This concentration will be more at the junction. If you have your own PowerPoint Presentations which you think can benefit others, please upload on LearnPick. It supplies a voltage and a current to a resistive load (light, battery, motor). The overall unit is of very small dimension nearly about 2.5 mm. Now customize the name of a clipboard to store your clips. Thus a pn junction is formed in diode. 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. 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