When the light illuminates the pn junction, the photons energy releases free. Ppt pn junction diode powerpoint presentation free to. You can get every basic information about pn junction diode and its working and some more information about the semicond slideshare uses cookies to improve functionality and performance, and to. The effect of adding this additional energy source results in the free electrons being able to cross the depletion region from one side to the other. The adobe flash plugin is needed to view this content. The forward bias voltage required for a silicon diode v t 0. Lecture 15 the pn junction diode i iv characteristics november 1, 2005 contents. Find materials for this course in the pages linked along the left. Workable on 230 volts, ac fitted with zener diode 8. Ppt pn junction diode powerpoint presentation, free download. Their values depend on the individual doping concentrations forward biasing the junction shrinks the depletion width and the barrier, allowing thermionic emission and higher current. Diodes and diode applications topics covered in this ppt semiconductor materials the pn junction diode voltampere characteristic curve diode app.
In 1906, lee dee forest added a 3rd electrode called a control grid and the triode, which is used as amplifier, switch the application of triode created a new era in broadcasting with the invention of the crystal radio sensor by pickard. Diodes exclusively block current in the reverse direction whereas the reverse voltage is within a restricted vary and if not reverse barrier breaks and conjointly the voltage at that this breakdown happens is termed. Minority carriers increased on both sides of the junction. Lecture 15 the pn junction diode i mit opencourseware. A pn junction with open terminals excluding minority carriers f.
Sep 18, 2015 3 intrinsic region offers the high resistance to the current through it. Powerpoint slide on pn junction diode compiled by paridhi gupta. The pn junction is a versatile element, which can be used as a. Diode seminar ppt and pdf report download study mafia. This is the voltage required to reach a flat band diagram and sets an upper limit typically an overestimate for the voltage that can be applied to a diode before it burns itself up. Contd notes and anderson2 sections part 2 preface and sections 5. The combination of ptype and ntype semiconductors results in a junction. Semiconductors class 12 physics india science khan. Zero bias no external voltage potential is applied to the pn junction diode. A light emitting diode led is essentially a pn junction diode. A free powerpoint ppt presentation displayed as a flash slide show on id. Silicon a single silicon atom consists of fourteen negatively. Semiconductor diode consists of a pn junction with two. Are specifically designed to operate under reverse breakdown conditions.
When carriers are injected across a forwardbiased junction, it emits incoherent light. Semiconductors and diodessemiconductors and diodes. Pn junction tutorial introduction to pn junction diodes. These diodes have a very accurate and specific reverse breakdown voltage. Semiconductor pure silicium p material boron doped n material stibium doped p material and n material pn junction pn. When the light illuminates the pn junction, the photons energy releases free electrons and holes. Pn junction diode baising and its vi characteristics. Pn junction diode characteristics explained in detail with graphs. Pn junction diode jeeneet physics class 12 youtube. The wide intrinsic region makes the pin diode an inferior rectifier one typical function of a diode, but it makes the pin diode suitable for attenuators, fast switches, photo detectors, and high voltage power electronics applications.
Forward biasing a pn junction opens a modal reverse biasing a pn junction opens a modal forward and reverse current mechanism opens a modal pn diode characteristics opens a modal pn breakdown and avalanche opens a modal. Dec 19, 2017 apr 04, 2020 ppt pn junction diode electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Diodes exclusively block current in the reverse direction whereas the reverse voltage is within a restricted vary and if not reverse barrier breaks and conjointly the. A pn junction is the metallurgical boundary between the n and pregions of a semiconductor crystal. Pn junction diode free download as powerpoint presentation. Outline semiconductor physics the pn junction biasing the pn junction the diode. Beside these easy and simple pn junction diodes, there are distinct types. Ppt pn junction powerpoint presentation free to download. The pn junction diode is the typical diode that has been used in the previous circuits. Formation and properties of junction diode physics youtube.
Ppt pn junction diode powerpoint presentation free to download id. Diode a diode is a specialized electronic component with two electrode called the anode and the cathode. Oct 09, 2018 a pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. Outlines introduction of zener diode construction of zener diode working of zener diode application of zener diode numerical of zener diode 3. This document is highly rated by electrical engineering ee students and has been viewed 850 times. So it was all about seminar on diode with ppt and pdf report, if you liked it then please share this seminar with your friends.
This is a physics video for grade 1112 students about pn junction diode, its properties, characteristics and uses. You can get every basic information about pn junction diode and its working and some more information about the semicond slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The pn junction has led to many inventions like the diode, transistors and integrated circuits. Diode characteristics due to differences between devices, each diode has a different voltage across it. Pn junction diode free electrons on the nside and free holes on the pside can initially diffuse across the junction. So, in this pn junction tutorial, we will discuss some of the basics of a pn junction, how a pn junction is formed, characteristics of pn junction and many other aspects. Forwardbiasing a diode allows current to flow easily through the diode. Photodetectors pn junction can detect light when reverse biased ptype ntype when the light illuminates the pn junction, the photons energy releases free electrons and holes. Pn junction diode junction diode symbol and static iv characteristics. Such junctions show a pronounced rectifying behavior. They are also called pn diodes in analogy with vacuum diodes. Throughout this methodology, free electrons which are from n aspect will.
This energy comes from the external voltage applied across the diode. They are referred to as photoelectrons and photoholes. Agenda semiconductor materials and their properties pnjunction diodes. A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. The pn junction can be formed by allowing a ptype material to diffuse into a ntype region at high temperatures.
Pn junction diode engi 242 elec 222 pn junction diode diode model analysis ideal approximation exact diode specification sheets diode resistance static resistance rd. Iv characteristics pn junction iv characteristics electron drift flow electron diffusion flow electron diffusion flow electron drift. This presentation is a very informative piece on pn junction diode an important part of electronics education. Ppt diodes powerpoint presentation free to download id. Doping with acceptor creates p type semiconductor while doping with donors produces n type. Power supply, output and meters connections are brought out on the panel. Was constructed with 2 electrodes in the form of a vacuum tube. It acts as a diode, which can serve in electronics as a rectifier, logic gate, voltage regulator zener diode. In case of a pn junction there are two bias conditions. Pn junction diodes a free powerpoint ppt presentation displayed as a flash slide show on id. Ppt pnjunction diode characteristics powerpoint presentation. Powerpoint slides and audio soundtrack, is strictly prohibited and may subject the offender to severe criminal penalties. Ppt diodes powerpoint presentation free to download. A k schematic symbol for a pn junction diode p n representative structure for a pn junction diode zener diodes.
Pn junction single piece of sc material with half ntpye and half ptype the. Introduction the zener diode is a silicon pn junction devices that differs from rectifier diodes because it is designed for operation in the reversebreakdown region. Semiconductor diode questions and answers pdf free download mcqs interview objective type. P type and n type semiconductors, takenseparately are of very limited use. In this tutorial, we will learn about pn junction diodes and in particular the characteristics and working of pn junction diode. Also, it explains the phenomenon of shockleyqueisser limit. Although it is not discussed majorly outside the concept of pn junction diode and sometimes the transistor, a pn junction is an essential topic in semiconductor electronics. A free powerpoint ppt presentation displayed as a flash slide show on. Sep 09, 20 near the pn junction the electrons diffuse into the vacant holes in the p material causing a depletion zone. Pn junctions consist of two semiconductor regions of opposite type.
Diode circuits tutorial pdf 25p this note covers the following topics. Ppt pn junction diodes powerpoint presentation free to. The pn junction diode the negative terminal of the biasvoltage source pushes the conductionband electrons in the n region toward the pn junction, while the positive terminal pushes the holes in the p region toward the pn junction when it overcomes the barrier potential v b, the external voltage source provides the n region electrons with enough energy to penetrate the. The pn junction is the fundamental building block of the electronic age. This depletion zone acts like an insulator preventing other free electrons in the ntype silicon and holes in the ptype silicon from combining. A diode is also a tool that exclusively permits unidirectional flow of current if the diode is operated at a particular voltage level. Ppt pn junction powerpoint presentation, free download id. Specialpurpose diodes 129 actually contain two pn junctions that are connected in reverseparallel i. The diode is formed by bringing two slightly different materials together to form a pnjunction in a pn junction, the p side contains excess positive charge indicating. Eventually, it can become large enough to cause the junction to break down so that a large reverse current flows. Ppt pn junction diode powerpoint presentation, free.
Our mission is to provide a free, worldclass education to anyone, anywhere. Read more pn junction diode and its working principle. This lecture uncovers the basic science of semiconductor devices and solar cells, including pn junction and photovoltaic effects. The pn junction and the diode effect, current in the diode, the pn diode as a circuit element, circuit applications of ordinary diodes, power supplies, power supply filtering, split power supply, diode gate, diode. Ppt pn junction diode electrical engineering ee notes. Semiconductor diode questions and answers pdf free download mcqs interview objective type questions for eee ece electronics students semiconductor diode skip to content engineering interview questions,mcqs,objective questions,class notes,seminor topics,lab viva pdf free download. The behaviour of the pn junction with regards to the potential barriers width produces an asymmetrical conducting two terminal device, better known as the pn junction diode. Electrical and telecommunications engineering technology department. Zener diode characteristic apparatus electronics equipmentzener diode characteristic apparatus with build in stabilized power supply. By exploring the electrical properties of silicon, it is possible to acquire an understanding of the inner workings of the pn junction. Pn junction is a significant building block and it is one among the indispensable structures. Powerpoint slide on light emitting diode leds compiled by c. From the above, it follows that zero power dissipation occurs in an ideal diode. If positive potential is applied to the top terminal as shown in fig.
Note to those familiar with a diode turn on voltage. Diodes and diode applications electronics ppt web4study. If a suitable positive voltage forward bias is applied between the two ends of the pn junction, it can supply free electrons and holes with the extra energy they. Pn junctions ece 663 in summary a pn junction at equilibrium sees a depletion width and a builtin potential barrier.
They are referred to as photoelectrons and photoholes the applied voltage separates the photocarriers attracting electrons toward. Semiconductor pn junction diodes physically, diodes are formed by the interface between two regions of oppositely doped semiconductor i. There are two operating regions and three possible biasing conditions for the standard junction diode and these are. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium. Dec 11, 2017 diode seminar ppt and pdf report download. Mar 19, 2017 this ppt is about semiconductor diodes. Najmabadi, ece65, winter 2012 high concentration of h on the p side holes diffuse towards the junction high concentration of e on the n side electrons diffuse towards the junction n side is positively charged because it has lost electrons. 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. Most diodes are made with semiconductor materials such as silicon, germa. Pn junction diode in the reversebiased configuration is sensitive to light from a range between 400nm to nm, which includes visible light. 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 2.
Thus a reverse biased pn junction does not conduct current. Rectifiers switching diodes zener diodes varactor diodes. Both diodes conduct the same reverse saturation current, is. Prepared by textbook based on electronics devices by floyd, prentice hall, 7. When one side of an intrinsic semiconductor is doped with acceptor i. Most of the commercial leds are realized using a highly doped n and a p junction. In addition this leaves a small electrical imbalance inside the crystal. Apr 05, 2019 in this tutorial, we will learn about pn junction diodes and in particular the characteristics and working of pn junction diode. This understanding will lay a better foundation for exploring further into different aspects of semiconductor electronics.
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