PN Junction diode. Questions you should be able to answer by the end of today’s lecture: A diode is a two-terminal unidirectional power electronics device. Forward biasing a PN Junction diode . The depletion width xd, where xd = xp + xn may be calculated from Drift Diffusio n Drift Diffusio n bi d a d V Small signal model of the diode: capacitances • Capacitance associated to charges • 2 types of charges present in the junction • Fixed charges (ionised dopants) in depletion layer • Mobiles (e-et h+) injected when forward biasing • 2 types of capacitance • Junction (or Transition) Capacitance • … As a result of this, the depletion region disappears and the potential. Hence the depletion region becomes wider and the potential barrier is increased. After that many types of diodes are invented. Reverse voltage above 25 v destroys the junction permanentaly. In this region, on the left side of the junction, the acceptor atoms become negative ions and on the right side of the junction, the donor atoms become positive ions (Fig 9.8). 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. Hence, under the action of the forward potential difference, the majority charge carriers flow across the junction in opposite direction and constitute current flow in the forward direction. Current-voltage characteristics of the p-n junction. Semiconductor (pn-Junction) Diodes Physically, diodes are formed by the interface between two regions of oppositely doped semiconductor (i.e., pn junction) and are thus, structurally, the simplest semiconductor devices used in electronics. One terminal of p-n junction diode is Anode and other is cathode. The distance from one side of the barrier to the other side is called the width of the barrier, which depends upon the nature of the material. A p-n junction diode allows electric current when it is forward biased and blocks electric current when it is reverse biased. A. AP Police Assistant Public Prosecutors Answer Key 2019 Out – Download... CSIR Recruitment 2019 Out – Apply Online for Senior Medical Officer... AIIMS PG Admission Notification 2020 Out – INI-CET Exam January 2021... Last Date Reminder for WBHRB Staff Nurse Grade II Notification. You have entered an incorrect email address! Vary V f gradually in steps of 0.1 volts upto 5volts and note down the corresponding readings of I f . Save my name, email, and website in this browser for the next time I comment. Working of a Photodiode. Diode is a basic element in electronic and digital circuit. Download >> Download Pn junction diode pdf Read Online >> Read Online Pn junction diode pdf working principle of pn junction diode pdf pn junction diode ppt vi characteristics of pn junction diode ppt When the positive terminal of the battery is connected to the N-side and negative terminal to the P-side, so that the applied potential difference is in the same direction as that of barrier potential, the junction is said to be reverse biased. interface or a boundary between two semiconductor material types 2. Photocurrents are produced due to generation of electron-hole pairs. T = Diode junction temperature in (o K) Important terms of P-N Junction Diode Breakdown voltage. Joining p-and n-doped semiconductors. With proper biasing, PN diode allows current to flow in SINGLE DIRECTION. All books are in clear copy here, and all files are secure so don't worry about it. 179 0 obj <> endobj View Notes - Chapter 06_PN Junction Diode.pdf from ELECTRICAL E239 at Information Technology University of the Punjab, Lahore. Static GK topics for Competitive Exams – Check Static GK Competitive... TS Constable Mains Answer Key 2019(Released) – Download TSLPRB Mains Question... Botony Study Materials – Important Topics, Sentence Rearrangement Questions and Answers – Download PDF. Working of a PN junction Current I-V characteristic of Reverse Bias a PN junction diode. From the foregoing discussion the i-v characteristics of a p-n junction diode can be drawn as shown in Fig 2.2. It allows electric current when forward biased and does not allow electric current when reverse biased. 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. 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. Depletion and built-in voltage. Circuit Symbol: Note: From the above, it follows that zero power dissipation occurs in an ideal diode! %PDF-1.5 %âãÏÓ This is due to the minority carriers flowing in the opposite direction. But, in practice, a very small current of the order of few micro amperes flows in the reverse direction. When the PN junction is forward biased (Fig ), the applied positive potential repels the holes in the P-region, and the applied negative potential repels the electrons in the N-region, so the charges move towards the junction. Doping with acceptor creates p type semiconductor while doping with donors produces n type. N-region, recombine with electrons in the N-region very close to the junction. 13 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 NAPS Releases BHEL Recruitment 2021 – 10th pass Candidates can Apply... APPSC Panchayat Secretary Latest Update on Exam Centers. Read online Module 1 Semiconductor (pn-Junction) Diodes book pdf free download link book now. Depletion layer opposes only the the majority carrier not minority carrier. endstream endobj startxref A p-n junction is the metallurgical boundary between the n and p-regions of a semiconductor crystal. Thus a region is formed, which does not have any mobile charges very close to the junction. Static GK topics for Competitive Exams – Check Static GK Competitive Exams || Download Study Materials Here!!!! During this process, the electrons crossing the junction from N-region into the P region, recombine with holes in the P-region very close to the junction. 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 difference of potential from one side of the barrier to the other side is called potential barrier. The word diode can be explained as ‘Di’ means two and ‘ode’ is obtained from electrode. Similarly holes crossing the junction from the P-region into the. Working of PN Junction Diode. Most electronic devices are made of sili-con. By exploring the electrical properties of silicon, it is possible to acquire an understanding of the inner work-ings of the p-n junction. The p-n junction is the fundamental building block of the electronic age. PN Junction diode is a device made of two semiconductor material joined together with the required amount of impurity. Thus a pn junction is formed in diode. Depletion region created across the pn junction by the initial movement of majority carrier across the junction. Silicon A single silicon atom consists of fourteen negatively A PN junction is the simplest form of the semiconductor diode. Junction coming to the equilibrium by balancing the Fermi level EF EF The balance is achieved by electrons diffusing into a p-side (bringing an extra negative charge in there) and by the holes diffusing into an n-side (bringing an extra negative charge in there) pn Hence, the potential barrier as well as the width of the depletion region are reduced. If an external potential is applied to the terminals of PN junction, it will alter the potential between the P and N-regions. Is called as p-n junction diode is a basic element in electronic digital... 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